A
Azrael
Guest
That doesn't mean it's the exact same story even if parts were reused. Aerith is still hinted to be a Cetra judging by how much Leon seems to fear her; Cloud's still going after Sephiroth for "past events"; Yuffie's still a Ninja, Cid's still into air-ships. They're not completely different. It just means Auron's story in KH has enough in common with his FFX story so they could reuse it.
And to top it all - Namine. No more proof needed to show Memories don't really mean squat in this series. If Hades could go as far as trap Auron's will, who's to say he didn't throw in a few "extras"?
Cid's into Gummmi Ships not airships, but same thing.
Yuffie an ninja, but not stealing Materia.
Leon is afraid of Aerith, how would have guessed?
But anyways, I want Zidane in BBS