If you want to have a common set of dashboards and saved searches, why not use a deployment server?
See: http://docs.splunk.com/Documentation/Splunk/6.3.1511/Updating/Deploymentserverarchitecture
If you want to replicate user created knowledge objects between splunk servers, you're better off using Search Head Clustering
See: http://docs.splunk.com/Documentation/Splunk/6.3.1511/DistSearch/AboutSHC
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