Replication When the Master and Slave Have Different Table Definitions
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Tables on the slave and the master do not need to have the same definition in order for replication to take place. There can be differing numbers of columns, or differing data definitions and, in certain cases, replication can still proceed.
Different Data Definitions - Attribute Promotion and Demotion
In most cases, it is possible to replicate to a slave that has a column of the same or a larger type than the master, for example a column defined as VARCHAR(10) will successfully be replicated on a slave with a definition of VARCHAR(12).
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