Here's a list of clone ROMS, taken from CHEAT.DAT.
(= means it's exactly the same, ~ means it's almost the same)

;005=monsterb=spaceod
;1941=1941j
;1942=1942a=1942b
;1943~(1943j=1943kai)
;3wonders=wonder3
;600~turpin=turtles
;64streej=64street
;88games=hypsptsp=konami88
;99lstwar=repulse=sonofphx~=99lstwra
;actfanc1=actfancj=actfancr
;aeroboto=formatz
;aerofgt=aerofgtb=aerofgtc
;airwolf=skywolf=skywolf2
;ajax=ajaxj
;alcon=slapbtjp=slapbtuk=slapfigh
;alexkida=alexkidd
;alieninv=cosmicmo=earthinv=invaderl=invaders=invadpt2=invdpt2m=jspecter=moonbase=sicv=sinvemag=sinvzen=sisv=sisv2=sitv=spaceatt=spacewr3=spceking=spcewars=superinv~polaris~sfeverbw=spacefev
;aliens=aliens2=aliensj=aliensu
;aliensya=aliensyb=aliensyj=aliensyn
;alpine=alpinea
;altbeast=altbeas2=jyuohki
;amidar=amidaro=amidaru=amigo=~amidars
;apb=apb2
;arabian=arabiana
;archriv2=archrivl
;area88=unsquad
;ark2jp=ark2us=arkanoi2
;arkanoid=arkangc=arkatayt=arkbl2=arkbloc2=arknoidj=arknoidu
;armorcar=armorca2
;assault=assaultj=assaultp
;astdelu1=astdelux
;asteroi1=~(asteroid=asteroib)
;astinvad=kamikaze
;astorm=astormbl=~astorm2p
;astrob=astrob1=astrob2
;astrof=astrof2=astrof3
;astyanax=~lordofk
;atlantis~atlants2
;atarifb=atarifb1=atarifb4
;atetckt2=atetcktl=atetris=atetrisa=atetrisb=tetris=tetrisa=tetrisbl
;aurail=auraila
;avenger2=avengers
;baddudes=drgninja
;bagman=bagmans=bagmans2=bagnard=sbagman=sbagmans
;battlane=battlan2=battlan3
;battlera=bldwolf
;battlntj=battlnts
;bayrouta=bayroute=bayrtbl1=bayrtbl2
;bbros=pang=pangb=pompingw
;bchopper=mrheli
;beastf~thglob
;berlwall=berlwalt
;bermudaa=worldwar=~(bermudaj=bermudat)
;berzerk=berzerk1
;bigprowr=tagteam
;billiard=hustler=hustlerb
;bionicc=bionicc2=topsecrt
;bktigerb=blkdrgnb=blkdrgon=blktiger
;bladestl=bladstle
;blckgalb=blockgal
;blckout2=blockout
;block=blockbl=blockj
;blockhl=quarth
;bloodbro=weststry
;blstroi2=blstroid
;blswhstl=detatwin
;blueprnj=blueprnt
;bnj=brubber=caractn
;boblbobl=bubbobr1=bublbobl=bublbobr=sboblbob
;bodyslam=dumpmtmt
;bombjac2=bombjack
;bootcamp=combasc=combascb=combasct=combascj
;bosco=boscomd=boscomdo=boscoo=boscoo2
;bottom9=bottom9n
;breakers~breakrev
;breywood=shackled
;brix=zzyzzyx2=zzyzzyxx
;brkthru=brkthruj
;btime=btime2=btimem~cookrace
;btlfield=skyadvnt=skysoldr=timesol1=timesold
;burningf=burningh
;bzone=bzone2
;cabal=cabal2=cabalbl
;canbprot=canyon
;capbowl=capbowl2=clbowl
;captcomj=captcomm=captcomu
;cawing=cawingj
;cbuster=cbusterj=cbusterw=twocrude 
;ccastles~ccastle2
;ccboot=ccboot2=cclimber=cclimbrj
;cchasm=cchasm1
;centipb2=centipd2=centipdb=centiped
;champwr=champwrj=champwru
;changes=looper
;checkmaj~checkman
;chelnov=chelnovj
;chikij=mtwins
;chopper=legofair
;chplft=chplftb=chplftbl
;circusc=circusc2=circuscc=circusce
;citycon=citycona=cruisin
;ckong=ckonga=ckongalc=ckongjeu=ckongo=ckongs=dkong=dkongjp=dkongjpo=monkeyd
;cninja=cninja0=cninjau=joemac=stoneage
;cobracmj=cobracom
;colony7=colony7a
;commandj=commando=commandu=spaceinv
;congo=tiptop
;contra=contrab=contraj=contrajb=gryzor
;cop01~cop01a
;cosmica=cosmica2
;cosmogng=cosmognj
;cottong=gutangtn=locomotn
;crazyblk=mrjong
;crazycop=gbusters
;crbalon2=crbaloon
;crimfght=~(crimfgt2=crimfgtj)
;crush=crush2=crush3=maketrax=mbrush=paintrlr
;csk227it~csk234it
;csprint~ssprint
;ctribe=ctribeb
;cyberb2p=cyberbal=cyberbt
;dairesya=farwest=ironhors
;dangar=dangar2=dangarb
;darkadv=~devilw=majuu (the weapon cheats for darkadv are completely different!)
;darksea1=darkseaj=darkseal=gatedom1=gatedoom
;dbldyn~dynduke (these are a LOT different!)
;dday=ddayc
;ddrago3b=ddragon3
;ddragon=ddragonb
;defcmnd=mayday=maydaya~defence~defender~(defendg=defendw)
;destderb=~destderm
;desterth=grescue=lrescue
;devilfsg=devilfsh
;devstor2=devstor3=devstors=garuka
;digdug=digdugat=digdugb=dzigzag
;digdug2=digdug2a
;dino=dinoj
;dkgensan=hharryu~hharry
;dkjrbl=dkjrjp=dkngjrjp==dkongjr
;dkong3=dkong3j
;docastle=docastl2=douni~dowild=jjack
;dogosoke~(ikari=ikarijp=ikarijpb)=victroad
;dorunru2=dorunrun=spiero~dorunruc
;dotron=dotrone
;dplay=einnings
;dsaber=dsaberj
;dspirit=dspirito
;dyger=dygera
;eagle=eagle2=fantazia=mooncrs2=mooncrsb=mooncrsg=mooncrst=smooncrs~mooncrgx
;eggs=scregg
;elecyoy2=elecyoyo
;elevatob=elevator
;elim2=elim2a
;empcity=empcityj=stfight
;endurob2=endurobl=enduror
;eprom=eprom2
;espial=espiale
;eswat=eswatbl
;excthour=matmania~(maniach=maniach2)
;exctscc2=exctscca=exctsccb=exctsccr
;exedexes=savgbees
;exerion=exerionb=exeriont
;exprraid=wexpresb=wexpress
;eyes=eyes2
;f1dream=f1dreamb
;fantasy=fantasyj=spectar=spectar1=targ
;fantzone=fantzono
;fastfred=flyboy=flyboyb
;ffantasy=hippodrm
;ffight=ffightj=ffightu
;finalizb=finalizr
;fireshrk~samesame
;firetpbl=firetrap
;fitter=roundup
;flicky=flicky2
;flkatck=mx5000
;forgottn=lostwrld
;fpoint=fpointbl
;frogger=froggrmc=frogseg1=frogseg2~froggers
;fround=hpuncher
;fshark=fsharkbt=hishouza=skyshark
;funkybee=~skylancr
;gaiden=ryukendn=shadoww
;galag88b=galag88j=galaga88
;galaga=galaga84=galagab2=galagads=galagamw=gallag=nebulbee
;galaga3=galaga3a=gaplus=gaplusa
;galap1=galap4=galapx=galaxb=galaxian=galmidw=galturbo=gteikoku=redufo=spacbatt=superg=uniwars=~swarm~(moonal2=moonal2b)
;galivan=galivan2
;galxwars=starw
;gangwarb=gangwars
;gaunt2p~(gauntir1=gauntir2)~gauntlet
;gberet=gberetb=rushatck
;geebee=geebeeg
;gensitou=prehisle=prehislu
;getstar=getstarb=getstarj
;ghostb~ghostb3~meikyuh	
;ghouls(=~ghoulsj)=ghoulsu	
;gladiatr=ogonsiro
;gng=gnga=gngt=makaimuc=makaimug=makaimur
;goldnabl=goldnaxa=goldnaxb=goldnaxc=goldnaxe=goldnaxj
;goldstar=goldstbl
;gondo=makyosen
;gorf=gorfpgm1
;gradius~nemesis=nemesuk
;gradius2=grdius2a=grdius2b=vulcan
;gradius3=grdius3a
;gravitar=gravitr2
;grindstrm~vfive (a lot of differences!)
;grobda=grobda2=grobda3
;growl=growlu=runark
;gtmr~gtmre
;gundeala=gundealr
;gunforce=gunforcu
;gunhohki=mysticri
;gunsmoka=gunsmoke=gunsmokj=gunsmrom
;gwar=gwara=gwarb=gwarj
;gyruss=gyrussce=venus
;hal21=hal21j
;hangly=hangly2=npacmod=pacheart=pacman=pacmanjp=pacmanm=pacmod=puckman=~jrpacman=~(mspacatk=mspacman=pacgal)=~pacplus=~piranha~pacmanbl
;hangon=shangon=shangonb
;hbarrel=hbarrelw
;hcastle=hcastlea=hcastlej
;helifira=helifire
;hitnmis2=hitnmiss
;hoccer~hoccer2
;hook=hooku
;hopprobo~springer
;hpolym84=hyperspt
;hunchbkd~hunchbks
;hydra=~hydrap
;hyprolyb=hyprolym=trackfld=trackfld
;imsorry=imsorryj
;indytem2=~indytem3~=(indytem4=indytemp)
;inthunt=inthuntu=kaiteids
;intrepi2=intrepid
;invrvnga=invrvnge
;jack=jack2=jack3
;jackal=jackalj=topgunbl=topgunr
;jackrab2=jackrabs=jackrabt
;joyfulr=mnchmobl
;jumpbug=jumpbugb
;jungleh=junglek=junglkj2
;junofrst=junofstg
;joust=joust2=joustg=joustr=joustwr 
;jumping=rainbow~rainbowe
;jungler=junglers
;kageki=kagekij
;kangaroa=kangarob=kangaroo
;karatblu=karatblz
;karatedo=karatevs=kchamp=kchampvs
;karnov=karnovj
;kick~kicka
;kicker=shaolins
;kicknrun=mexico86
;kidniki=yanchamr
;kingbalj=kingball
;kingofb=ringkin2=ringkin3=ringking
;klax~klax2=klax3=klaxj
;knights=knightsj
;kod=kodb=kodj
;konamigt~rf2
;kram=kram2
;ktiger=twincobr=twincobu
;kuhga=vaportra=vaportru
;kungfub=kungfub2=kungfud=kungfum=spartanx
;kuniokub=kuniokun=renegade
;kyukaidk=kyukaido
;ladybug=ladybugb
;laser=spcewarl=spclaser
;lastduel=lstduela=lstduelb
;lastmiss=lastmss2
;ldrun=ldruna
;ldrun2=ldrun3~ldrun4
;ledstorm=madgear=madgearj
;leprechn=potogold
;lethalth=thndblst
;lgtnfght=trigon
;lifefrce=lifefrcj=salamand
;liquidk=liquidku=mizubaku
;lkage=lkageb
;lomakai=makaiden
;losttmbh=losttomb=~superbon
;lwings=lwings2=lwingsjp
;machomou=suprmou2=suprmous
;maglord~maglordh
;mainevt=mainevt2=ringohja
;majest12~ssi
;majtitl2=skingam2=skingame
;mappy=mappyjp
;marble=marble2=marblea
;mario=mariojp=masao
;marvland=marvlanj
;megaforc=starforc=starfore
;megaznik=megazone
;mercs=mercsj=mercsu
;mgakuen=~mgakuen2
;mhavoc=mhavoc2=mhavocp=mhavocrv
;mia=mia2~miaj
;midres=midresj=midresu
;mikie=mikiehs=mikiej
;minefld=rescue
;minigol2=minigolf
;missile=suprmatk~missile2
;mk=mkla3=mkla4=~(mkla1=mkla2)
;moguchan=zodiack
;monwar2a=moonwar2
;moonwalk=moonwlka=moonwlkb
;motorace=travrusa
;mpatrol=mpatrolw=mranger
;mrdo=mrdofix=mrdot=mrlo=mrdu=yankeedo~mrdoy
;mrviking=mrvikinj
;msword=mswordj=mswordu
;mtrap=mtrap3=mtrap4
;myhero=myheroj=myherok
;naughtya=naughtyb=naughtyc
;nemo=nemoj
;nibbler=nibblera
;ninjak2a=rdaction~(ninjak2b=ninjakd2)
;ninjemak=youma
;nomnlnd~nomnlndg
;nov2001u=nova2001
;nprinces=nprincsb=nprincsu=seganinj=seganinu
;nrallyx=rallyx=rallyxm
;nspirit=nspiritj
;offtwalc~offtwall
;oscar=oscarj=oscarj0=oscarj1
;outrun=outruna=outrunb
;outzone=~outzonep
;ozmawars=solfight=spaceph
;p47=p47j
;pacland=pacland2=pacland3=paclandm
;pacmania=pacmanij
;pacnchmp=pacnpal
;panic=panica=panicger
;passht4b=passshtb=passsht
;pbaction=pbactio2
;pcktgal=pckgal2=pcktgalb
;pengo=pengo2=pengo2u=penta
;phoenix=phoenix3=phoenixa=phoenixc=phoenixt=(pleiads~pleiadce=pleiadbl)
;pinbo=pinbos
;pipibibs~whoopee
;pitfall2=pitfallu
;pitfigh3=pitfight
;pkunwar=pkunwarj
;polaris=polarisa
;polepos=polepos1=polepos2=poleposa=poleps2a=poleps2b=poleps2c=topracer
;ponpoko=ponpokov
;pootan=pooyan=pooyans
;popeye=popeye2=popeyebl
;popflama=popflame
;poundfor=poundfou
;pow=powj
;pspikes=svolly91
;psychos=psychosj
;punchout=spnchout=spnchotj
;punisher=punishrj=punishru
;punkshot=punksht2
;puzzldpr=puzzledp
;pyros=wardner=wardnerj
;qix=qixa=qixb
;quantum=quantum1=quantump
;quartet=quartet2=quartetj
;rabiolep=rpunch
;raiden~raidena=raidenk
;rampage=rampage2
;rampart~rampartj~ramprt2p
;rastan=rastanu=rastanu2=rastsaga
;rbtapper=sutapper=tapper=tappera
;regulus=regulusu
;relief~relief2
;retofin1=retofin2=retofinv
;roadf=roadf2
;robocop=robocopb=robocopu=robocpu0
;robotron=robtryo
;rockrage=rockragj
;rocnrope=rocnropk
;rodland~rodlandj
;rollerg=rollergj
;rompers=romperso
;route16=route16b
;rpatrolb~silvland
;rthun2=rthun2j
;rthunder=rthundro
;rtype=rtypepj~=rtypeu
;rtype2=rtype2j
;rugrats=wiping
;rushcrsh=srumbler=srumblr2
;rygar=rygar2=rygarj
;satansat=zarzon
;sbbros=spang
;schaser=schasrcv
;scion=scionc
;scobra=scobrab=scobras~800fath=mariner=scramblb=scramble=scrambls
;scontra=scontraj
;sctionza=sectionz
;sdi=sdioj
;searchar=sercharu
;secretag=slyspy=slyspy2
;sectrzon=seicross
;sengokh=sengoku
;sf2=sf2a=sf2b=sf2e=sf2j=sf2jb~(sf2accp2=sf2ce=sf2cea=sf2ceb=sf2cej=sf2rb=sf2red=sf2t=sf2tj)
;shadowld=yokaidko=youkaidk
;shdancbl=shdancer=shdancrj
;shinobi~(shinobia=shinobib)~shinobl
;shisen=sichuan2=sichuana
;shollow=shollow2
;shootoub=shootouj~shootout
;shuuz=shuuz2
;sidearjp=sidearmr=sidearms
;sidepckt=sidepctb=sidepctj
;silkworm=silkwrm2
;simps2pj=simpsn2p=simpsons
;sinista1=sinista2=sinistar
;skullxb2=skullxbo
;skykiddo=skykiddx
;smashtv=smashtv4=smashtv5=smashtv6
;snowbroa=snowbrob=snowbroj=snowbros
;solarwar=xsleena=xsleenab
;spacebrd=spacedem=spacefb=spacefbb=spacefbg
;spaceplt=timeplt=timepltc
;spacfura=spacfury
;speakres=stratvox=stratvxb
;spiders=spiders2
;spinlbrj=spinlbrk=spinlbru
;spool3=spool3i
;sprint1~sprint2
;spyhnt2a=spyhunt2
;sqixbl=superqix
;spacetrk=sptrekct
;sspacatc=sspacat2=sspaceat
;ssrdrabd=ssrdrebc=ssrdrebd=ssrdrjbd=ssrdrubc~=(ssrdruac=ssrdruda=ssriders)
;starjack=starjacs
;starwar1=starwars
;stratgys=stratgyx
;streets1=streetsj=streetsm
;strider=striderj=stridrja
;supbtime=supbtimj
;superpac=superpcm
;svolley=svolleyk
;swimmer=swimmera
;sws92~sws93
;sxevious=~xevious=~xeviousa=~xevios
;szaxxon~zaxxon=zaxxon2=zaxxonb
;tankfrce=tankfrcj
;tazmani2=tazmania
;tdfever=tdfeverj
;tempest=tempest1=tempest2=temptube
;terracra=terracrb=terracre
;terraf=terrafu
;theend=theends
;thnderxj=thunderx
;tknight=wildfang
;thehustj=thehustl
;tigerh=tigerh2=tigerhb1=tigerhb2=tigerhj
;tigeroad=toramich
;tmht=tmnt=tmntj~=(tmht2p=tmnt2p=tmnt2pj)
;tmnt2=tmnt2a=~tmnt22p
;tnk3=tnk3j
;tnzs=tnzsb=~tnzs2
;todruaga=todruagb
;toki=toki2=toki3=tokib=tokiu
;tokio=tokiob
;tomahaw5~tomahawk
;toobin=toobin2=toobinp
;totcarn=totcarnp
;tp84=tp84a
;triviabb=triviag1=triviag2=triviasp=triviayp
;trog=trog3=trogp
;trojan=trojanj=trojanr
;tron=tron2
;tsamurai=tsamura2
;tturf=tturfbl=tturfu
;tumblep=tumblep2=tumblepb=tumblepj
;turbo=turboa=turbob
;tutankhm=tutankst
;uccops=uccopsj
;vangrdce=vanguard
;vanvan=vanvans
;varth=varthj=varthu
;vastar=vastar2
;vendett2=vendetta=vendettj
;venture=venture2=venture4
;vigilant=vigilntj=vigilntu
;vimana=vimana2=vimanan
;vindctr2~vindictr
;vsyard=vsyard2=yard
;vulgus=vulgus2=vulgusj
;warpwar2=warpwarp=warpwarr
;wb3=wb3a=wb3bl
;wbdeluxe=wboy=wboy2=wboy3=wboy4=wboy4u=wboyu
;wbml=wbmlj=wbmlj2=wbmlju
;wc90=wc90b
;willow=willowj
;wh1~(wh2=~wh2j=~whp)
;wiseguy=yamyam
;wiz=wizt
;wof=wofj
;ws=~ws89=ws90
;wwester1=wwestern
;xmen=~xmen2pj=~xmen6p
;yiear=yiear2
;zigzag=zigzag2
;zookeep=zookeep2=zookeep3
