>>51216924Ganon is the personification of evil you see mentioned in the legends every time.
Ganondorf is the Garudo dude that Ganon reincarnates into every time.
If you see Ganondorf and he looks like Ganondorf, he's Ganondorf. If he gets beat up and suddenly transforms into some monster, he's no longer Ganondorf because he doesn't look like the Garudo dude and most likely lost his mind, thus becoming "Ganon" now.
Keep in mind I have read zero lore about Zelda and I haven't played any of the games.