Different devices uses different database tables ?

Hi
I have 2 devices at home which I want to be synchronized with the ‘watched’ statues.
I’ve read the Kodi manual for setting MySql database (Syncing_and_sharing (wiki)) and both devices seems to use it
The problem is, it looks like they are using different tables so the ‘watched’ status isn’t synced
One device is using myvideos93 table while the other is using myvideos99
As I see here the table extension is some kind of version, do I really have to use the same version (version of what?) for all my devices ? what happens when I upgrade ?

Thank you !