70-pin CAT ECM Differences

I've got a 2002 C-12 with a bad ecm, more information here: C-12 No Start

I have purchased the equipment (CAT ET & J1939 DrewLinq Interface) to program ecm's, but haven't purchased an ecm for my truck. Can any 70-pin ecm be programmed to work for my truck if the appearance is similar to the original ecm? For example, can I take a C7 Acert ecm and reprogram it for my C12? I have the flash and config file that goes with the truck.

I have read and researched about different protocols and on/off road ecm's, but haven't got a clear understanding.

Picture of original ecm:

 

Any idea where I can find more information on interchangeable ecms?

I sent it out to two different places, both said it's dead and unrepairable.

 

This is a toy/project, I bought it for $6500. Trying to replace the ECM for around $1000-1200. I went to my local CAT dealer to get some info, for the hell of it he quoted me a new one. $2700 for ECM plus around $1000 to program.

I bought it with a bad ECM, it could happen again. I know of another person that bought a similar running truck, his ECM randomly died within the first month of ownership. From what I've gathered it happen every 7-10 years.