My memory is foggy, but I think they can be....provided you have the motor, too. The gears on the electric motors and regulators was changed. It's why when I sell a regulator, I always sell it with the motor. I don't think you can interexchange the motors if the gear teeth have a different size/count.

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daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
No longer selling Cluster Needles Paint
No longer selling New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more