Need some clarification on RHEV hypervisor support.

Hi,
I need some clarifications on hypervisor and manager compatibility and support.

Here is the Redhat support matrix for RHEV hypervisors.

Release Supported Compatibility Levels

6.2 3.0
6.3 3.1, 3.0
6.4 3.2, 3.1, 3.0

Is this means that, whenever a new RHEV manager gets released, will not have the support for old hypervisors??
i.e, can 6.3 hypervisor be managed with RHEV manager 3.2????

I have tried this in one of my configuration and I was able to manage 6.3 hypervisor as a 3.1 compatibility mode. Is this supported??

Thanks,
Inbaraj