Read your Factory Service Manual for a caution about the 2nd row seats:
"NOTICE: The seat base must be in the locked position, using the shipping pin, prior to seat removal, otherwise damage to the seat linkage components may occur."
This may be what happened to the seats I bought as they are "locked" with the seat backs folded down and won't unlock.
It's also my understanding the headrests are different between Expedition and Navigator though I don't know exactly how.
Yes, with some rewiring you can bypass the memory function on the driver seat. You can also simply swap the seat frame to your existing tracks, adding new wires for the power recliner if your original seat was 6-way power or with little or no rewiring at all if your original seat was 10-way power.