Migrating VM to new supervisor - general question

Hello, I planned to move my VMs to a new (VM) supervisor, because I want to use another operation system for it. I am doubting myself, if this is such a good idea. When all my VMs are on different disks, can I just install a different OS on the root partition and just import the qcow2 files afterwards. Or am I risking losing my VMs/disks? I am a little bit afraid of messing it up... Thank you.