Anderson window casement operator 7198-17

A quick learner from Mass says:
I need to replace the operator for both left & right anderson casement window. The strait arm operator looks correct. However, it has a different part number.

On the back of my operator it is stamped:
Does this make a difference?
User submitted photo of their 7198-17 Andersen casement window operator.
Profile picture of Mike
Mike from SWISCO responded:
Yes, I believe you need the 39-150 and 39-151 style operator to replace your old Andersen operator. Just check that the arm on your original operator measures the same as the 8-3/8" arm (as measured in the product photo in our catalog). I believe yours does, but your pictures is not clear enough for me to be absolute certain about it.
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