Switching 39-031 with 39-253L

A home owner from Cosmos MN says:
I have a number of Crestline Vinyl casement windows which use the 39-031 EntryGard dual arm operators. I have a number of the 39-253L Maxim dual arm operators. Is it possible to replace the entrygard operators with the maxim operators and what additional hardware would I need to replace?
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Tom from SWISCO responded:
I don't think the 39-031 and 39-253L are interchangeable, unfortunately. There are too many differences and I don't think you could get the 39-253L to work without extensive handiwork. I recommend sticking with the 39-031.
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