Nah, there's no huge differences. I hope you enjoy FFVI. Its a great game.

And also, I think Cain/Kain had some excellent character development, especially if you talk to him near the beginning of the game before you set off on your adventure. He tells you a lot about himself. And Edward was developed too, I think, with the whole Anna situation, and conflict with Tellah, and his facing his fears and whatnot...