Help identifing a GPz engine by engine Number

Hi All,
I have been offered a GPz 1100 A1 engine, that I hope to use for spare parts for my Z1100R
There seems to be some doubt over the engine if its a GPz1100A1 or GPz1100 B1 or B2
Before I part with cash can anyone help by advising what the engine number sequence should be for a GPz1100a1
the parts I want to use could be the Head and rocker cover, the cams, and generator side casing,
I had hoped if it was a GPz1100A1 I could also rebuild it at a later date for a spare engine for my Z1100R
I hope some one can shed light on engine numbers, and what parts if any are interchangeable from a GPz1100 A1 or B1 to a Z1100R.
as I believe if the engine is a GPz1100A1 most of the parts except the gears will b interchangeable for spares
thanks John

Not sure this will help you or not but check out info at zedder.com

zedder.com/Info/81%20KZ1100-B1%20GPz.htm
zedder.com/Info/82%20KZ1100-B2%20GPz.htm
zedder.com/Info/83%20ZX1100-A1%20GPz.htm
zedder.com/Info/84%20ZX1100-A2%20GPz.htm

Cruzi...you are correct in that the KZ1100R1 shared its' motors with the ZX1100-A1 engine series. The series can be identified by using the info supplied by gd4now

Thanks very much, I hope to meet the guy selling the engine and from the info you supplied work out if it is worth buying.