Moving form GMaps to CMaps, using multiple maps in a single dashboard is not supported. The reason is that both map components conflict with each other.
With CMaps Plugin 4.1.1 a new series of properties were introduced allowing you to dynamically change the map size and position dynamically to accomidate scenarios where multiple maps were previously used. The idea is to allow a single dashboard to have multiple map views without the overhead of a second map.. This dramatically helps performance.