Flashing newer firmware on my device topic

Hi, i recently bought used GT i9505 for little money knowing it has its Knox Warranty Void 0x1 , im currently on this firmware and modem I9505XXUGNH8 , and from what i see its old firmware .

I have been reading alot about knox enabled firmware and other stuff related to modems and bootloaders

Now my question is can i flash newer frimware from Sammobile like those below without any consequence ?

Model: GT-I9505
Model name: GALAXY S4 LTE
Country: Switzerland (Swisscom) (Black Edition)
PDA: I9505XXUGNH7

OR

Model: GT-I9505
Model name: GALAXY S4 LTE
Country: Slovakia (Black Edition)
PDA: I9505XXUGNG8