GX200 / Hisun swap (flywheel question)

Swapping a couple modified GX200s for the stock hisun motors on two Coleman BT200x. Realized the GX200 doesn’t have charging coils and flywheel magnets. Are flywheels interchangeable between the two motors? I see some people saying the tapers are the same. Also noticed that one GX200 has a shaved flywheel key (advance timing??) and the other appeared to have no key at all... should I leave the shaved key and put an OEM key in the shaft that’s missing one?