6.5 Diesel TCM info wanted

[Niinikoski Juha]

I have 97 Hummer NA Diesel with 4L80E transmission. Transmission controller
(TCM) in my Hummer is:

serv no 16196390  BRZY
86BRZYMC62330269
16229189  BRZY


I have another TCM box

serv no 16196390 BXNS
86BXNSMC71040526
16244899  BXNS


1.
can anyone explain how to read these numbers. What is hardware type /
version and what is software version ?

2.
Does anyone happen to know differences of these boxes ?

Best Regards
Juha Niinikoski