The ECM fried in my 94 s10 blazer and i'd like to by a used one if at all possible. I'm know I'll have to get a new, blank PROM and take it to my mechanic to have it programed.
What i was wondering was if all the numbers on the ECM have to match, or if it's just the service numbers. Here is everything that is printed on the ECM I removed from my truck.
Serv. No. 16196395 BHRJ
*86BHRJK540554727*
16195925
*86BHRJK540554727*

The numbers to the used ECM I'm trying to purchase are all the same as mine, except for the numbers in between the asterisks.

 

Here is a link to an ECM manufacture that could answer that:

http://www.autocomputersystems.com/contactus/