Install specific proxmox/ceph versions

I have a virtual cluster within my active ProxMox cluster. The versions they are running have gotten out of sync and I want to get them back in sync before I upgrade my live cluster to ProxMox v8.3.1 and Ceph Squid so I can do a test upgrade in my virtual cluster. I need my virtual cluster to go from 8.2.2 to 8.2.4 and Ceph to actually downgrade from 18.2.4 to 18.2.2. I assume if I just do apt full-upgrade it will take it to 8.3.1. Is that correct? Is it possible to downgrade Ceph Reef...

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