It appears to be several different motors for the P-body over the years. I have a 87 motor and also several from 91+.
I would guess they should exchange as the mounting plate is the same and even the same electrical connector. The 91+ motor and gears are smaller in size. I tested both on my lab power supply and both draw similar current to each other. I estimate on the order 6 amps 12V. The 91+ I tested may turn slightly faster but I did not time.
Are the various P body wiper motors interchangeable?