MySQL Error 1062 after reboot node in multi master replication
You should use pt-table-checksum to see the differences between the source and the replica. If the differences are many, importing data again from the source could be the fastest solution. Otherwise, you could restart MySQL with --slave-skip-errors=1062, fix the errors with pt-table-sync, and then restart MySQL normally.
To understand how these tools work and how they are used, take a look at this article: MySQL replication primer with pt-table-checksum and pt-table-sync.
You may also want to take a look at another tool called twindb-table-compare, which is complementary to pt-table-checksum. It reads the diffs generated by pt-table-checksum on the source and on the replica, and prints them in a format that is easier to understand, similar to the output of Linux utility diff.