I think the only difference is a "slight" difference in the nut length vs washer thickness to the tune of about 1/8" or less difference
as I understand it, they are swappable in both brands and all that changes is the number of threads (2 or 3 extra) that will be sticking out passed the castle nut
I would use the thrust washer (between prop and lower unit) from the motor brand so you are assured of the correct spacing there
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