As far as I can see the pinouts / connectors are the same on the 5 inch radio only and radio/sat nav models.
View attachment 421318
You will of course lack / have missing possibly some other connections but the wiring looks to be the same.
I don't know what car system menus settings you have on your existing radio unit. On the Sat Nav unit I have then some of the car's settings are only available on the uConnect and not on the dashboard menu control.
After swopping you will almost certainly need to do a Proxi Alignment with a suitable diagnostic tool (e.g
MES) but there could still be niggles.
Another point to mention is that if you are only after Sat Nav then you are probably better off with a Garmin or Tom Tom unit with Lifetime Maps.
My 500X 2015 has uConnect 5 Inch with Sat Nav andthe maps are not free. Upgrading maps is expensive. I have a Garmin with lifetime free maps and when going long distance / abraod I use the Garmin. The 500X maps are backup or for local use where road changes are not so frequent or that critically important.
PLEASE NOTE! I have not attempted to upgrade or change my 500X's uConnect 5" Sat Nav unit. All I offer is what is above and I hope others with more on hands actual experience will be able to chip in.