Factory 600HP CM871, ECM code compatible?

[JMBT]

Hey guys and gals, I am trying to help a friend get her and her husband's truck running to sell it. (he got sick and they had to quit trucking). It was recently at a stealershit who tried to take them for every cent they could and it still isn't running right. So I thought I would see if anyone could tell me if the current ECM code is even compatible with the Engine# and CPL#, before I start trying to diagnose things further. Thanks in advance!

Engine# 79271465
CPL# 2734
Current ECM Code# AV10269.12