Not sure what the point is. Does mis-matched serial numbers make a gun more likely to jump up off the table and just start killing people?
Nonetheless; interesting analysis.
I think that the TTAG reader had it right; it is not a mismatch.
If it were, it might be interesting to see if the serial numbers on the slide and barrel are from a stolen gun.
As others have noted, the frame number is the one that counts for legal purposes.