7427 ECM

I see this seems to be a popular one (7427). What’s the reason??
Also here you talk about different colors of them so I guess your talking about the colors of the connectors?
The one in my truck has a red/blue connector and a service number of 16196395.. Are you swapping ecm’s from different cars/trucks and then tuning??
Also anyone here piggy back a ecm to use with a E trans and use the ebl to tune??

Lots of questions and this is all new to me so I have been reading as much as possible and any insight you can give me or point me what to read will be great. Thanks

Yes red blue referes to connector colors. Your 6395 operates the same as a 7427. I suspect there was something different in them but I swap between them with no noticeable difference.