Multiple wallets

I have 4 different installs of Brave on 4 computers. Each seems to have a different BAT wallet. I noticed that there is a “recovery key” with the BAT wallet. Can that somehow be used to merge the wallets or . make them all use the same wallet? Without losing BATs?

(of course, I still don’t know what good a BAT is, what the value is, what I can do with it.)