I cannot say if the Bolos are different, but both of my fullsize pistols have no serial numbers on the bolts. All I have are the crown-U proofs. One is circa 1905 and the other a 1930's type.
I have read mixed opinions on replacing the bolt stops. Its my understanding that the available replacement are used originals or chinese fabricated. I would carefully check for signs of damage of course, but would be hesitant to replace one that looks fine with another equally old one or of dubious manufacture.
I would definitely change out all the springs with those sold by Wolff just to be safe.
Out of curiosity, which parts are the mismatches?
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