Have a customer who has a test server licenced for Windows Server 2012R2 Data Center. They have 20+ VMs on there - all Data Center editions.
Now they're moving to a live environment spreading those VMs over 4+ physical hosts. So it makes sense to licence the live hosts with Standard edition.
However, the VMs in the test environment are all DC editions and they're looking to do a direct copy to the live environment. Assuming they have enough Standard licences to cover the total number of VMs, does it matter if some of the VMs are running DC edition?