There is a MAC version of Calibre
The Library has the same structure.
That said, If you WANT copy a Library (or settings), run/and
fix) Library Maintenance BEFORE continuing.
then do the copy.
Then run Library Maintenance AGAIN on its new system
If you (now) see Missing books, you may have case issues.
The Quality check PI:
Check and Rename Book Paths may help
FIX all problems before going further