Long story short, I have a PCM from a 1999 4.8/5.3 (Red/Blue connectors) and as of tomorrow will instead end up with a 2004 5.3L L59 engine which looks like uses the PCM with Blue/Green connectors. Will the PCM with Red/Blue function ok as long as I use a matching Red/Blue harness to connect to the 2004 5.3L? Reason I ask is I already bought a PCM with VATS deleted etc and a standalone wiring harness for the 1999, of which turned out to be a 4.8L (one of my many lessons learned as a newbie to these modern engines ).