Comments - Row-based Replication With No Primary Key
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If you are currently replicating between MySQL 5.5 servers, it should work exactly the same way with MariaDB 5.5 server as a slave.
If you are currently replicating between MySQL 5.6 servers, after replacing the slave with MariaDB 5.5 server you might encounter the same problems as you would have by using MySQL 5.5 as a slave, since replicating from a newer master to an older slave has its limitations.