Sorry Brian, bit confused, so have to ask again to make sure I understood correctly:
the base on the scopeless rifle is stamped 36 on bottom. That very same 36 is stamped on the SSR mount (with scope) on your other rifle? The SSR mount currently on the scopeless rifle does NOT have a pairing number on the bottom of the dovetail?
To my understanding these are pairing numbers and not assembler numbers, because due to their contruction they had to be matched to each other. So making in batches of like 100 pieces each does make sense. But that is just personal understanding.