01 scrambler 500 4×4

Having issues with wiring , I have a 04 500ho that’s wrecked and was wanting to change all the electrical from the 04 to the 01 . Everything mounts the same but the ID of the flywheel on the 04 is a quater inch smaller . I need to know if the flywheel is balanced to that particular engine or can they be swapped ? Any help or input is greatly appreciated.