WHAT???
Is Ganon different form Ganondorf?
A good way to put it is they're different characters but the same person. Just like Zero Suit Samus is to Samus, or Mario and Dr. Mario. Think of a character in any kind of game or whatever as a particular form one can be in. And multiple forms would be multiple characters, even if it's the same species. Take Pikachu. If you see, say, 3, then they're each a different character for all intents and purposes in a story. But the person would just be "one" version. Another example is Metal Sonic and Metal Overloard as well. Each form is a different character in the way fiction is created. But they're still the same person. This is why in a ton of games, different forms are uniquely playable too. Because they're treated as separate characters overall. Smash goes with this mindset. Officially, Brawl has 39 characters, as ZSS/Samus are treated as two different ones, Pokemon Trainer is split among three characters, and Zelda/Sheik also are two separate characters. This is also why separating transformations is very easy for Sakurai to begin with, cause they're not the "same character". Multiple personas are too commonly split up, so it was an easy mindset to work with. Hell, Capcom's own fighting games loves to do this; Street Fighter, Marvel VS Capcom. Worst part is some barely feel as notable as Dr. Mario(who at least has a distinct projectile), like Bone-Claw Wolverine in MvC2. Which isn't even as good as, say, Lilith Aensland in MvC1, the clone of Morrigan Aensland. The clones in the first one actually played uniquely enough, with many different animations and stat changes. And only one was highly unique, being the joke character, Roll(to the point that she can barely win against Hulk, and doesn't do well against the rest of the cast).
Ganondorf is the actual human form and didn't originally have Ganon as his transformation till later in-story. He didn't have that access till he got the Triforce of Power. It's unclear if it's the Triforce or Demise's Curse that outright created Ganon. The only thing Demise's Curse is clear on is that it basically influences Ganondorf to have to be evil. He can't literally be good.
Ganon itself is always a pig form, and it can be bipedal or quadripedal. The most unique one so far is from BOTW, the final form, which barely has any "legs" shown all the time, as he can take a somewhat ghostly appearance, still having the boarhead. This particular form resembles the TP design, both being called Demon Beast depending the languages. Worth noting that Demon Beast is not the original wording in TP, and is a bit of an error. Not that it doesn't fit. Ganondorf was created as an alternate form to increase the lore and give a reason to why such an intelligent beast existed. Skyward Sword continued it by emphasizing that Ganon was a product of more than just one person being taught to be evil, but a curse. Which considering it strips some of Ganondorf's free will(he still controls what he does, but as I noted, can't legitimately be a good guy), was not met well by many. Hell, Smash separates them pretty well, especially in Ultimate's own story mode. They're treated as different people effectively, with no ties to each other beyond a similar name. But that mode is weird, since unlike Brawl's SSE, "transformations" aren't actually in the story to begin with. Soooooooo, they made the lore strange. Not that it means much, as it doesn't even follow its own story perfectly(Kirby should not have any actual spirit battles, but he does, despite never being captured).