I aquired a prototype FF game randomly through ebay.
It is nearly the same as the retail USA version except for a lot of the monster names are different, there are some textual differences and one or two other graphic changes (mainly battle back grounds)
here is the difference list I found after playing through it (used game genie to get to level 50 and ran thru it)
Going to start playing the final version tomorrow to see if there is anything else I missed.
Tomb stone in elf land is different, doesn't say here lies eridrick.
CRAWL = Crawler
Gargoyle = GARGOYL
Spiner != spider (no idea what it is)
aracnid = Spiner
Scorpion = SCORPIO
wizard = DEMON
Astos's name spelled wrong when you talk to him, spelled Aatos. spelled ok in battle
R.Sahag = grSahag
if all enemies run you get 1exp
words run off the end of box when you talk to guy about tnt in dwarf cave.
cocktrice = coctrice
kyzoku = kaizok
Carbie = pranha
OCHO = OHCHO
cant run from Demomns
Sorcerer = SOULDEAT
Frost D = WhiteD.
=GrANKYLO
SAURIA = BASLISK
MUDGol = GOLM
ZombieD = ZombD.
Saber T = GrTIGER
FrWOLF = WhWOLF
GreyWorm = R.WORM
AGAMA = SALMNDER
RED D = RedD.
R.ANKYLO = GrANKYLO
FrGATOR = WhGATOR
R.CARIBE = R.PRANHA
Bigeye = S.EYE
Lobster = CRAB
SeaSNAKE = S.SNAKE
SeaTROLL = S.TROLL
ZomBULL = Z.BULL
IMP = GOBLN
grIMP = grGobln
CHIMERA = CHIMER
Blue D = BlueD.
RockGol= WzGOLM
Slime = VIRUS
templte of fiends battle background
Gas D = GreenD.
Phantom = Z.EYE
WORM = P.WORM
GreyWorm = R.WORM
SeaTroll=S.Troll