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https://www.mamp.info/en/downloads/
MAMP PRO will create copies of the MySQL databases located in
/Applications/MAMP/db/mysql57
and store them in
/Library/Application Support/appsolute/MAMP PRO/db/mysql57
Any modifications you make using MAMP PRO will go to these copies and will not be available in MAMP (which will continue to use the original databases).