Of course it is possible but is done by shell as not available in gui. Approach is just different depending where the vm and lxc on host resides and which storage type you use. Eg. first have rocky9 lxc on one pve and then move to ubuntu24 vm on other pve :
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Edit: Just seen they have different local timezone settings of 1h ...

Longest part is shutdown and new boot for accepting new disk and as it's here a file move between dir's on nfs server in a second even it could be x-TB's so done in a handful on minutes.