Question about MySQL



I have 2 machines ( 1 & 2 ) running Kodi 19.3 on windows 10.
They both share a MySQL database running on my server perfectly.

If I was to add another 2 machines ( 3 & 4 ) but these running kodi 21.0 and both set to use the same MySQL data base on my server.
I know V.19 uses MyVideos119.db and V.21 uses MyVideos131.db So…….
Am I correct in thinking that machinines 3 & 4 would use an entirely different database and they would only share with each other leaving machines 1 & 2 to share together without interfering with 3 & 4.

Or would something else happen

New to MySQL forgive me if that sounds dumb

Thanks