The supplement manual has some things that are unique to certain models of the 500. It has a few exploded views, some torque values, and pointers for specific items.
The main kawasaki manual assumes mechanical training and aptitude and the supplement is only a footnote to the main manual.
I have all three manuals (Clymer, Kawasaki service, and supplement) and still found myself scratching my head.
If I only had one manual it would be the Clymer, like stated in the previous posts it has all the torque values, has better illustrations, and walk-throughs that most can follow.
Dale