An approach to Whonix upgrade

Hello. Can I only upgrade Whonix Gateway VM to version 16 but leave the old Whonix Workstation? As far as I heard, Gateway is a key VM in Whonix project so it is important to keep Gateway up-to-date but as for Workstation, you can use any OS you like with Gateway so an upgrade for Workstation VM is not so important as upgrading Gateway.

Whonix 15 End of Security Support and Deprecation Notice - All users should move to Whonix 16!