Pella Folding Crank and Lock Kit - Difference between 39-403 and 39-404

A home owner from Naperville, IL says:
It's not obvious to me what the difference is between the two models - 39-403 and 39-404.

Is one for the left casement window and the other for the right casement window, in the case where I have two casements side by side?

Thanks
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Tom from SWISCO responded:
Yes, the 39-403 and 39-404 are different sides of the same pair. One goes on one side and the other goes on the opposite side.
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