I think the only real copy cat would be 'big units'. Games using a continuum to determine battle order is not that uncommon by far, and having locations you can capture to get permanent bonus' is also fairly status quo for any role playing game.
Also, Lauvhk is very correct that there are a few fundamental differences between KB and HOMM.. mainly that one is a turn based game with strategic levels of management, and the other is a role playing game with tactical combat.
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