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Honestly, it would be exactly the same.
Final Fantasy is just in there for the fanservice and to lure FF fans to KH.
The characters don't have any great effect on the plot, and I honestly think it would be easy to replace them. =/ Not that I want that to happen.
I don't mind the Final Fantasy characters. Especially when they fit in with the game nicely. But, obviously, the spotlight should stay on Disney and not Final Fantasy.