Also neither of those schematics has a heated wheel button shown, unless I am blind lol I just realized one is the CTS-V, it uses the resistor array as well, oops.
Now that I realize that, looking at them it should be an easy fix. Most annoying part is the buttons aren't in the same order between the 2, otherwise its just resistor swap, but because the CTS does the 'V' key before the '^' one, and the Escalade is the opposite and they are in a series array of resistors so order is fixed, the resistors would have to be soldered to only one pad and jumpered to the correct one. I might grab a cheap cheap CTS button set and Escalade set and see. Hardest part is not knowing what the boards themselves look like.