Unfortunately it is not that simple, with differences in the many other modules between vehicles (eg, Corvette to Commodore) all the modules need to be talking the same language, each ECM program is configured specifically for that model vehicle and generally won't work when swapped in to another.

I don't think GM ever offered E85 from factory on any of the supercharged V8 engines using the E67, only some of the older V6's had it.