I'm of the same state of mindset as 40T and pathfinder....
The assumption that two or more consecutive numbered guns, were assembled by the same craftsman or even side by side.
Or even the same Day or even week, is merely a wishful thought by the consumer, perhaps even fed by the Manufacturers hype or slight of hand, sales wise that they be identical.
Perhaps, worthy of passing observation , but not Remarkable ....
What is rare or remarkable is the rather Corsican like nature of finding consecutive numbered guns, having gone on to separate
locations, owners & use....be available at two separate locations by two different sellers at the same time...