This seems like the sort of question that could be answered by experimentation. If you have access to both a Mysql and a MariaDB, you could set up the same test tables and data, and run the same operations on both to see if they return the same numbers.
If you only have access to MariaDB, I guess it's a matter of setting up test tables, test data, and test operations in such a way that you can confirm what the return values actually correspond to (in some set of scenarios relevant to your application).
If it really matters to you how this compares to a Mysql server, but you don't have access to try that out, perhaps you could post your experimental tables, data and operations here, and someone who does have Mysql could try it out and tell you what they get.
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