I *think* that functionally, there is other stuff that comes as part of the full Luxury Climate Control option. I believe that the residual heat function has a separate pump, there's a sunshine sensor, and an additional charcoal filter.
I don't suppose that any of that matters in day to day use, though.
Thats correct. I believe you can retrofit the charcoal filter and the residual heating. Dont know about the sunshine sensor. I have done this too and looked into retrofitting the other parts but the costs doesnt make it worthwhile.