For windows there's nothing needed to be done. For RDS Cals you can follow along here for migration.
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/migrate-rds-cals
QnA currently only supports the products listed in right-hand pane (more to be added). Your post is off topic here. Better to reach out to subject matter experts in dedicated forums over here.
https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=ws2016
https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=winserverTS