Yes

I do not think that the diameter of the flywheels are different. 216 and 235 and 261 flywheels will bolt up to any of those engines, and any of those flywheels will fit into the clutch housings for any of those engines (if I am incorrect, someone will correct/clarify).

The number of teeth on a 6v vs 12v flywheel (and 6v s 12v starter) are different. The shape of the teeth on 6v and 12v starters are different

The diameter of clutch/pressure-plates might be different.

The length of the clutch release (throwout) bearing matches the pressure plate.