From a quick internet search I'm pretty sure it's a KZ750-H2 Ltd.
Also, the engine numbers & frame/vin numbers aren't supposed to match.
The sites I use for motorcycle identification >> Kawasaki dot com. CycleChaos dot com. Zedder dot com. motorcyclespecs dot co dot za. Zedder has some model info available on the site, but if your motorcycle isn't listed, you'd have to buy the CD. I don't know if the software has info for non-North American models.
Most Kawasaki parts diagrams are for USA & Canada (North America).
1981 KZ650-CSR. Competition, Sports & Road.