Same mainboard -- the only real difference between the two models is the screen size. All the required drivers will be identical.  
We have a Latitude 7390. It required a warranty repair back in May when the MB was replaced. It fixed the issue at the time.However, now it has come time to rebuild this laptop I am noticing that in Dell Command Update, and in Azure/Intune it's actually listed as a 7290. This could explain why a number of issues have arisen if the drivers are wrong.The case says 7390. The Service Tag says 7390. The repair documents all say 7390 but the laptop thinks it's a 7290. Even after updating the firmware to the latest version (1.22)Is there any way to update the laptop (BIOS?) so it knows what model it really is and can correctly identify appropriate drivers and updates?
Latitude 7390 now thinks its a 7290 after warranty repair