Another question that wasn't touched on at all is if the navigation head unit rear panel combo connector (big square) is the exact same as used for the Professional Radio head unit.
Photos of the rear panel of both head units appear to suggest that they are the same: the layout, location, and types of plugs seem to be similar. I just can't confirm if the part numbers are the same via RealOEM because I can't find any diagrams that list explicitly the connector for the pro-radio head unit (
it's depicted in the diagram but not in the parts list); the CCC/CIC connector is PN 61138384580:
But this part number is only listed under the CCC/CIC diagram when searched for on any vehicle.