2019 MacBook Pro is one letter off on serial number

[Jim Cal H]

I just bought a MBP 2019 15 inch used and the serial number on the back is different than About this Mac by only the final letter. Any insight on why?
Computer seems to be completely functional.

 

[bob_zz123]

Perhaps the logic board was replaced; service centres always (historically) used to have to run a tool after logic board replacement to write the serial number to the new logic board and perhaps there was a typo? It's one of these kind of "write once" procedures so if they noticed the mistake they couldn't correct it (short of replacing the board again) and there's absolutely nothing you can do about it.