@Jayboxer,
I assume it is the same in most other places, but in Canada it is illegal to modify a VIN number or to modify an odometer.
Switching units from one vehicle to another is not allowed.
As a result, it is not known if Dodge allows a way to do it.
Based on my experience with a 2015 RAM, I expect the ECU would have to be sent back to the factory and even dealers could not do it.