compare/sync databases from different computers
You can use Percona's pt-table-sync tool, even if the two MySQL instances are not setup for replication, with this caveat:


  pt-table-sync does one-way and bidirectional synchronization of table data. It does not synchronize table structures, indexes, or any other schema objects


So something like this command (if they're not set up in replication..there's other options for the tool if they are):

pt-table-sync --dry-run host1 host2


After you're comfortable with the report, run it:

pt-table-sync --dry-run host1 host2


When using this tool, I would first make a backup of both instances. Always backup in case an issue arises!