Can i flash COI9 over (branded+stock) COH2?

Hey guys!

I got a question, can I just flash the french XEF update COI9, available since a few days, over my older, branded COH2 firmware without wiping or factory resetting anything? I don't want to wait for my updates for ages...

Current AP: G920FFXXU2QOH8
Current CP: G920FXXU2COH2
Current CSC: G920FVFG2COH4
Model: SM-G920F

It should be a branded S6 from Austria.

Thanks for ur help, I appreciate it!

Greez