I would expect the heated seats needs coding, I did read a thread about a year ago where someone retrofitted them and I think it was a costly procedure.
You need to run extra wiring to them from what I remember and may have issues sourcing the seats that have the correct functions that match the existing setup (full/half electric, lumbar/no lumbar)
You would also need to add the buttons as I'm sure they will be just blanked out normally.
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