We have two environments.
1. Sandbox for experiments and testing upgrades.
When we created these, CA had us share an Enterprise Dashboard repository. We want to upgrade the Sandbox from 10.0 to 10.3, but leave production at 10.0 until we fully validate the 10.3 upgrade in our sandbox. I want to make sure that if we upgrade to 10.3, we don't break our production environment through the Shared Enterprise Repository.
Yes, you can connect your DevTest 10.0.0 Registry to a DevTest 10.3.0 Enterprise Dashboard.