You could use snapshots - that function can be used to have multiple states of the same VM which you can switch between, but I wouldn’t personally want to leave any VM using snapshots for a prolonged period.
Thank you Scott - but I want to have full independent VM-ware virtual machines with the two versions.
Why is it that you need to access a physical disk?
* power off the guest
* copy the folder with the guest files
* answer "i moved it" to avoid a new MAC when starting the copy
* avoid power on both at the same time
* that's it