Help with E38 which ECM and TCM to use

[Hideintire]

HELP! I purchased a 2008 6.2/6L80E to install in my 2004 Silverado SS. The guy did not have the ECM...hack job of removing engine...but only 75,000 on motor. My question...Since I will have to buy an ECM, what year would be best? I understand it is best to match MY of ECM/TCM. Motor has VVT, but no AFM/DOD. I want to flash the TCM with a Corvette operating system, so I can utilize TUTD. There is no 2008 Escalade stock tune on Dropbox! BTW...there is no 2008 Corvette auto tune on Dropbox either...or so it appears. Will 2009 or 2007 work? Is there any advantage to purchasing an ECM from a 2008 Escalade? I will need to disable VATS, but no BCM is involved since I will be piggybacking on SS ECM for dash functions.

Afterthought...If there is a chance that the 08 ECM will send the proper signals to dash, BCM, etc...is it possible to link BCM to Escalade ECM using EFILive?

Thanks for the help...and yes I'm just learning!!!!
Jim