I've just bought MrMC for my new ATV4

I have an existing ATV2 that I've re-installed Kodi on as a fresh install. Have been a long term XBMC/Kodi user....thought a basic no add ons kind of user at that.
I'll be doing a fresh library 'scrape' for my ATV4 MrMC install, linking to MySQL on my NAS.
I have a few questions if I may....
Can I in turn share the subsequent MrMC MySQL db to the ATV2 Kodi install, are they 'compatable?
Will future updates to MrMC, possibly mean that db versions change and I can no longer use it along side my ATV2 Kodi install?...Which will no longer be supported by Kodi as I understand it.
Is there a dummies guide anyone can point me to to get the MySQL side of things working on my ATV2 Kodi install?.....I've looked at the Kodi wiki, it's a bit confusing for me.
Cheers
Jeff