Could be, but after the latest Spider-Man movie, different universe of same people played by different people isn't strange anymore.
Afterall Eggman Nega isn't Eggman but a distant descendant of Eggman.
I'm not sure if that's still true. Either Nega is an alt-dimension version of Dr. Eggman or at some point in the future one of Dr. Eggman's descendants both time-travelled and dimension-hopped to the Sol Dimension.
I never finished any Kingdom Hearts games. The story always confused me and I was too lazy to explore them.
I used to follow them in the first two games, then they had more spin-off games as PERSONA and lost track of it all.
Of course it's a secret.
You don't want your competitors use that to their advantages.
you don't want your customers eating c*m either.