[2021] Question About Updating Offline Progression

Hello All!

I play Vermintide 2 on Xbox and had a quick question regarding the system that allows you to update your offline profile with your online progression. I was wondering if anyone knows whether updating from my online progression would overwrite my offline progression, or if it would combine them. I'm asking because I play both online and offline, but play offline much more frequently bc while I'm decent at the game, I get worried often about dragging teammates down and like to practice alone. I didn't mind having separate progressions before, but now that SotT is available on Xbox, and since I only play Kerillian online, I wanted to update my offline progression for her.

Sorry for the wall of text, but I've looked in a bunch of other places and haven't found a clear answer, and I really don't want to lose my offline progression. If anyone has a definitive answer it would be greatly appreciated, thanks in advance!