No, he wouldn't hit as hard, but using his own technique however he did have more single shot power. Hypotheticals like this don't really work, as every fighter is built differently and has different ways to use their natural tools. Foreman was quite a bit bigger than Tyson with much longer arms but far less natural speed and slow reflexes. He never could've learned to throw combinations or attack in close the way Tyson did, it's no different than asking what if Tyson punched like George Foreman did. He couldn't have, there is just no way.

I understand where you're coming from though, as Foreman is one of those inexplicably heavy handed big men who seemingly didn't have proper form a lot of the time but still threw freight trains.