Will 39-091 replace Roto P4900

A handy person from New Mexico says:
The numbers are very hard to make out but I have a pair of what I believe to be Roto P4900's. It looks like these units you have here are the same size. Can you confirm that these work as a direct replacement please and let me know all the parts I'd have to replace to make these windows work smoothly with them? I plan at least to do the operators and new crank handles but wondering if I need the Pivot Hinge Set, Connecting Arm Sash Bracket, etc? I think the locks are still good. Thanks, Stef
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Tom from SWISCO responded:
I'm afraid I wasn't able to match that number up to anything, so I can't confirm if our 39-091 is what you want. Could you show me a picture of the part in question? That will give us a better idea.
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