Thank you, so I didn't understand correctly the 9.2 beta article.
Yeah I already use 9.0 for my WP2 and my setup is a mariadb one .
I wanted to push my pi3 to the 9.2beta but if there is a bump in kodi version, the database will not be the same.
I think i'll wait until 9.2beta (or final) will be available for all my setup.