@dmz0001 In theory, XCP-ng 8.3 is mostly on par with XenServer 8.4, it's only a naming thing that they did as their previous naming was confusing some of their customers. Long story short, XCP-ng ~= XenServer 8.4. So what you see in the compatibility list of XenServer 8.4 is the right reference for XCP-ng 8.3.
Unfortunately we do not have much feedback on Zen 5 at this time on our side.