They do look different, but will 99% likely fit each other without problems.
Heck there's probably a good historical precedent for that, as a lot of the III & IV components would fit.
Mechanically it'll work fine.
Tiger I - Panzer III - Panzer IV - Chi Nu Kai - Panther G - KV-1b 756(r)
M4A3(76) Sherman - T-34/85 - M3 Grant