I'm afraid the answer, in general, is "NO." But, in some cases, it's "MAYBE."
As much as possible, Ford tries not to include wiring that's not needed because it costs more money. Then again, it's also expensive to design, make and stock many different harnesses and sub-harnesses for multiple options. Thus, they will try to consolidate as much as they can. This is why I believe the 202A package became available on base XLT models starting in 2015. It was a way of consolidating wiring in order to save money.
One thing I know for sure is the wiring for the rain-sensing wipers is not included in XLT trucks. It's a separate sub-harness. I am in the process of adding that option and I found this out the hard way.
If your ultimate goal is to add heated/cooled seats, you are in for a long and difficult journey. When I bought my old 2009 XLT with cloth seats, I thought I could upgrade so I got some seats from a 2010 Navigator. After obtaining the wiring diagrams (something I should have done *first*) I discovered there is no direct connection between the heated/cooled seat control buttons and the seats themselves. It's all done via computer modules over the vehicle network.
Not only did I need to solve the mystery of how to add the buttons (since I had manual climate control), there were also two new modules needed that my truck didn't have, plus there was also the potential that several other modules might need to be reprogrammed in order to make it all work. The result of all this is I still have those beautiful seats in storage and they never made it into my truck.
Bottom line: While it's theoretically possible to upgrade to memory/heated/cooled seats, it requires some computer "hacking" in order to make it work. Yes, thanks to FORScan we have more tools available today to assist in this sort of thing. But, as far as I am aware, no one has ever successfully done this upgrade in an Expedition.