MySQL DB vs MARIA DB compatibility for PHP and Wordpress

My question ... Maria DB = MySQL DB?  (In terms of compatibility, aside from the whole Oracle/OpenSource/Original Authors story)
Details ...I just moved a Wordpress site and several PHP Scripts (unrelated to WP) from a web server (Linux/Apache) to a new web server (Linux/Apache).  I just found out that the new server is running Maria DB 5.5.47, whereas the old server was running MySQL DB 5.5.25.
I hit a couple of snags to get the WP site and a couple of the PHP Scripts running, so before I start posting error log results & specifics, I was wondering, in general, if anyone has had experience with Maria DB, if it should be a drop-in replacement for MySQL ... or if there is an incompatibility list of any SQL Statements that may need to be changed, etc.
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bleggeeAsked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
There is no incompatibility between MariaDB and MySQL in the community editions that you will find on web site hosting.  There are premium versions of both that have additional features.  It is more likely that you are seeing differences in the PHP version?

I maintain a couple of ecommerce sites.  We moved two from hosting with MySQL to hosting that uses MariaDB and never even noticed.  When I download the tables from the site for backups, I upload them into a MySQL server without problems.

According to this page https://en.wikipedia.org/wiki/MariaDB ,  Maria DB 5.5.47 is an older version.  But then so is my MySQL version here.  The web hosting I use has version 10.
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