If it's a Beretta what's the difference? $15? They are basically machine made guns so they are meant to interchange. What is important to be honest - that's the bottom line.
A dear departed friend of mine was a high grade target gun dealer who specialized in one line of guns. Because of their interchangability he would make up a gun for each of his customers specially based on their wants for barrels, actions, stocks, trigger group, and so on, as well as the different clay games they played. Are these guns worth less or more than off the shelf configs you could buy from other dealers?
Now if it was an H&H Royal I would be more interested. How does it affect the value - how much more is a true pair worth than a matched pair? Perhaps the later gun used better materials but the same craftsmen were involved. Every situation is different...
Frankly I'd rather have a (second) pair of XXV barrels fitted to my 30" (London gun) by Churchill in the '30s than by the original maker (unless they used the same barrel filer, ha!) because EJC specialized in that configuration. Kinda like having a Boss trigger fitted rather than some other maker's ST, all other things being equal.
Comments?