KH III isn't going to be released for some time, will most likely be a significantly smaller soundtrack than FF XV (if we're judging by past games in both series), and the music isn't usually worked on nonstop throughout a game's entire production. Didn't Hamauzu complete XIII's soundtrack in just a year?
It's hard to say whether or not she'll remain the sole composer, but I don't think it'd be surprising if she was.
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