I can confirm the following as I have just installed 2022 Laramie GT seats in my 2021 Ram Rebel. I had the black leather but they were not ventilated.
I can confirm it is all plug and play. Even the installation lines up.
The front seats are easy. I still need to play with AlphOBD in the next day or so to see if I can program the ventilated seats as the heated seats are working great. I have seen where it appears other members have been able to accomplish this. Hoping the AlphaOBD programming for the ventilated seats will work - I have read the forum posts and I hope to be able to decipher, piece together and program successfully.
The rear seats also installed successfully. At first I thought some of the bolt holes were missing but they were hidden by carpet and also the reclining part of the Laramie GT bracket needed to be in the right position for the bolts to line up. The only thing missing is the middle striker plate, you can install this
Folding Seat Lock Striker Mopar 68272017AB fits 20-22 Ram 1500 | eBay. The seats still work fine without this striker plate and the other rear brackets do not interfere with the back of the seat.
The heated rear seats are working as my existing Rebel seats had heated seats as well. Even the upgraded middle console is nicer than the existing one I had. I really do like the Reclining feature - not sure how much it will get used but it is nice.
My next project is to add 360 surround cameras - it looks daunting and not sure if it has been done a 2021 Rebel. I have the 12' Screen, heads up display and rear camera mirror.