Upgrading Multiple Environments

Is it absolutely necessary to perform a transfer between environments after an upgrade?

Dev, QA and Prod are all sitting on their own server. I have upgraded all 3 to the latest TimeXtender version and all Deployed and executed perfectly. Would I still have to do the “Multiple environment Transfer” or is this not necessary?

1. Upgrade Dev - Deploy, Execute, & Validate all is working. 
2. Upgrade Test - Deploy, Execute, & Validate all is working.
3. Transfer Dev -> Test - Deploy, Execute, & Validate Test to ensure all is working.
4. Upgrade Prod - Deploy, Execute, & Validate all is working.
5. Transfer Test -> Prod - Deploy, Execute, & Validate Prod to ensure all is working