I just upgraded from 1700X + ASrock AB350 ITX to 2700X + MSI B450M Mortar. I noticed that using MSI's live update feature (windows based driver/utility updates) the AMD Chipset drivers is 17.40.2815.1010. Now I'm still fairly new to AMD scene, but on AMD's website the latest chipset driver is 18.10.0830. So I assume the chipset driver on AMD website is the latest one?
The B450M Mortar has quite a peculiar driver support. The website doesn't have the latest updates, only through the live update app that I found the latest update for the motherboard.