It would most likely be an aftermarket one... The dash and climate control system is completely different between the two models.
If the dealer doesn't have a Crosstour with OEM Nav, and that's what you want, I would not settle for an aftermarket solution.
However, if you would prefer to save the money (which I'm assuming you would be), or have an aftermarket system, then by all means take the dealer up on their offer. This solution should maintain use of the OEM climate controls... but I would find out exactly what system the dealer was planning on installing.
If the dealer doesn't have a Crosstour with OEM Nav, and that's what you want, I would not settle for an aftermarket solution.
However, if you would prefer to save the money (which I'm assuming you would be), or have an aftermarket system, then by all means take the dealer up on their offer. This solution should maintain use of the OEM climate controls... but I would find out exactly what system the dealer was planning on installing.