If you are using Gearset to develop for a 1GP managed package:

Your deploys between VCS and dev orgs/scratch orgs DON'T use namespace in the metadata filter

Your deploy from VCS to Packaging org MUST USE namespace in the metadata filter - otherwise, everything in the difference viewer appears as NEW rather than CHANGED (if truly just edited during dev cycle)

So, when cloning a deployment, one should have the option to add the namespace to the clone dialog.

Without this, one has to repeat the Compare step thus losing the benefit of what you had enumerated in a prior deployment - leading to errors.