new to tuning, Locked 2003 4.7l Dakota.

i have a 4.7l dakota i would like to use to learn to tune. my first hiccup is that the PCM is tuner locked. unless i can find a way to bypass this, my plan is to simply replace the PCM and revert to stock tune and go from there.

unless someone knows a way, or service, to break the tuner lock. i have no means of even locating the shop as it was bought used with with tune in place. near as i can tell the PCM is NGC3.

also, does the exact part number matter. i.e i can buy a PCM P56028722AA, is this compatible with my P56040495AG system?