Move PD Workflow from one env to another


I am thinking to move my workflows ( KM, Change - cm3r, cm3t) workflows from one environment to another environment. Can i do it via unloads ?. What are the objects which needs to be involved ? 

I have a classic workflow which was migrated to PD during the upgrade. The changes made manually on the workflow needs to be moved into my higher environment.

I am on Hybrid 941 environment.

plz guide.