As a main of both characters; I guarantee you, he wasn't just a slower and more powerful Captain Falcon. "B moves" are called specials, just so you know, it is probably easier typing out "specials" rather than "B moves." Precisely, if you can't play Ganondorf as you would Falcon, they are not clones. Again, this was found on the Smash Wiki.
- A completely different Final Smash and some different standard attacks (Neutral, Up-Tilt, Down-Tilt, Forward-Tilt, Up Smash and F-Air), but some normal moves are still similar. And most notably, they both share 3 special moves, with the main cosmetic difference being that Captain Falcon has fire effects in his specials, while Ganondorf's specials feature darkness or electricity. Raptor Boost and Flame Choke are initially similar, but the difference is that Raptor Boost launches the opponents, while Flame Choke grabs them, slamming them straight down.
The other similar moves do not even function similarly as the physics, weight, power, and knock-back all vary significantly. His play-style is entirely different. At first glance, you can certainly tell that they have similar moves, but it isn't necessarily about the moves, it is about the play-style. The moves are used quite differently.
Now, Warlock Punch could probably be altered without complaints from most Ganon mains, maybe his recovery move as well, but other than that, he doesn't really need any drastic changes. He is already quite different. That being said, I expect minimal changes, after Smash 4, Ganon will not be similar to Falcon.