the comp isnt the same exact tuning. There are slight differences, especially with the hardware-side. To confirm this all you have to do is disconnect both edges from a map sensor. The comp will fuel as if @ 19psi, the juice will throw a code and not fuel properly.
Really? The map sensor is unpluged from my juice right now, cause the wire is damaged going to the juice, and my truck fuels just fine and no code is showing. So I dont know how that applies to any other trucks, just saying that is what mine is doing right now and has been doing for the last 3 months.