Підійде хостинг з MariaDB, для сайту який розроблявся на MySQL ? Зможу я зайти в PHPMyAdmin і зробити імпорт MySQL бази в MariaDB ?

MariaDB: Since MariaDB is a fork of MySQL, the database structure and indexes of MariaDB are the same as MySQL. This allows you to switch from MySQL to MariaDB without having to alter your applications, since the data and data structures will not need to change.

This means that:

    data and table definition files are compatible
    client protocols, structures, and APIs are identical
    MySQL connectors will work with MariaDB without modification

Even the command line tools are similar with mysqldump and mysqladmin still having the original names, allowing MariaDB to be a drop-in replacement.

To make sure MariaDB maintains drop-in compatibility, the MariaDB developers do a monthly merge of the MariaDB code with the MySQL code.
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MariaDB vs MySQL. A Comparative
Written by Matan Sarig|March 28, 2017
http://blog.panoply.io/a-comparative-vmariadb-vs-mysql

можлива нетипова поведінка. БД на базі зроблена.