The motor is a generic design by SWF, then nidec, then NTT now Valeo or whatever other merger it has been.
All Jobo machines use the same basic generic motors, which are available from third parties who supply them, some of them have the correct shaft, but they are about 2-3 times more expensive then what Jobo pricing was.
The shaft is the same on all, if it fits the bosch motor you got it will fit all, BTW as far as i can tell the w126 body headrest motor is the same, but has a different headrest bracket, the motor also has a different shaft.
As for the revs, that should be controlled electronicly through the circuit, and should be 75 as far as i remember (but i do have a b12 deficeincy, so i might be remembering wrong..)