Aparently the Ki 84 with the 30mm Cannons as listed in Bunschnells(if thats how ya spell it) was not actualy made in any signastudmuffinant numbers if at all, so it is prety much not even an option, kinda like the MK 103 on the FW 190.
The Frank and the George did I am prety shure have the same engine, the Army and Navy designation was different but it was the same engine.