Your 2500 is quite different than the 1500. The seats are different, HD Rams don’t have ventilated rear seats, and use a different rear heated seat module.
All HD Rams, regardless of trim level or options, are fully wired up for fully loaded front and rear seats in the body wiring under the carpet. The center console harness will not have the connectors for the rear switches, and the dash harness that plugs into the main center console harness will not have the wires for the rear switches either.