User blog comment:Titanollante/Zilla 1998 is Godzilla/@comment-20636354-20141102025423/@comment-25285745-20141102030324

I think it's probably just a legal thing. Tristar will force the 1998 incarnation of Zilla to be called Godzilla because they paid for the rights to Godzilla and the film is called Godzilla. Tristar can't prevent Toho from calling any future incarnations of it Zilla because Toho owns the character Godzilla and specifically trademarked the 1998 design as "Zilla."