Someone can correct me if I'm wrong, but I do not believe that functionality was ever in the LHs, nor could it be added. I had a 06 Town and Country RB1 in my 02, and it provided the same functionality as my 04 does. That being said, the EVIC in the Specials will display when you set the memory seats, and might show if you press it altogether (never paid attention). I'm almost positive, as well, that it will display a 'Chrysler' logo instead of a Jeep one. Many of the Intrepid owners who swapped in Special PCMs now see a 'Chrysler' logo when their RB1s pop-up; that seems to be another PCM-dictated feature.I noticed the cost cutting when I couldn't find a 2002 Dodge Intrepid R/T with a power passenger seat. Will it have all the functionality if I swap in a RB1? In the Jeep it displays if and when you hit the memory buttons. I can find Jeep RB1's without a problem but wouldn't it display Jeep when the car starts if I put a Jeep one in.
And any RB1 should have the same capabilities as any other; the LH PCM dictates a vast majority of the features. The one notable exception is that the 05 + RB1's can support U-Connect (which was never a feature in the LHs, and obviously 05 RB1's didn't come in them either). Just be advised there, however, that that's a considerable investment to get that functionality.