FFIII, FFVI, AND FFIII JAPANESE
Okay. Lets start with the DS version of FFIII. I think it is very close to the orgininal game. They totally redone almost everything when they transfered it to Super Nintendo. Remade the story, change character names, made the game shorter, different names for things. Just everything. Now when they made the DS version. It is closer to the original, that was only released in japan. It shares the same storyline, and characters. But they remade the job system, so there are no super races, like the Mage and the Ninjas. The changes they did were only minor.
But as I was saying, when they made it first for the Super Nintendo for North America, they renamed the game to FFVI, changed almost EVERYTHING about the game. To meet the North American restrictions on games, at the time. Such as nudity, pot smoking, the names, the storyline, sprites, signs. What I think is, the DS version is very very close to the original japan game. Just as I said, minor tweaks to the job system, and that is really about all. Plus I guess they changed the four main characters a bit, including gender, backgrounds.
Well this is all I can think of right now. Um, give me feed back on this, and I will reply. I just barley found out this information.