I stumbled upon this by accident. But Billy Zane at imdb.com is cast in Kingdom Hearts II as the voice for Ansem/DiZ. Implying that they are indeed one and the same. Or DiZ is Ansem's new host since Rikku, or whatever. But they are definitely closely related. I've kinda been avoiding spoilers so if this is old news, feel free to make me look like an idiot. Here's the link:
http://imdb.com/name/nm0000708/
http://imdb.com/name/nm0000708/
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