Hello,
You can clone VMs from Host to Host in the same Data Center. The 2.5.3 host can not be placed into a VMware Cluster. But as long as the 2.5.3 host is in the same VC Data Center, then all is fine and your clone will work.
Best regards,
Edward
--
Edward L. Haletky
vExpert XIV: 2009-2023,
VMTN Community Moderator
vSphere Upgrade Saga: https://www.astroarch.com/blogs
GitHub Repo: https://github.com/Texiwill