I'm having zero luck with the Kaw USA parts fiche, trying to compare the zx/zzr abs stuff, as they don't show parts for the ZZR..
Id check to see if the wheel speed sensors, and sensor discs compare to this on the zg, first thing, which I'm having difficulty finding for the ZZR...
If they compare, then the "pulse count " thru the ecu should allow the pump interchange, as long as the harness and fittings are the same...
Worst case scenario is if you can pick up one from a ZZR, and install it, and have someone with a KDS system verify functions of the system, then id try it.