Rear wheel on K4 and K2
 

Hi all wondered if anyone could help me, I have a spare rear wheel for SV650 which is the earlier one, I want to fit to K4 is it correct that the only differences is the bearing sizes in the rear wheel are smaller on the earlier ones? If so anyone suggest where to get bearings from other than Suzuki

have found out that wheel bearings and inner spacers are difference oh and disc but I am not worried about that.