yes...hygain bought out cdr and now mfj owns hygain..so my guess is that it is compatable with your other rotor. Maybe you can take the broken rotator apart and salvage parts out of the other one. I have fixed my ham-m3 several times. they are easy to work on. I have a manuel if you need one. Let me know and I will copy it for you. It shows a breakdown of the inside parts.
my email is firstname.lastname@example.org