You cannot use one Order ID to activate two instances of GeneSpring.
To activate another instance of GeneSpring on a virtual machine which is on the same machine, using the same Order ID, you need to 'Surrender' the license/Order ID from the first instance. Then, use the same license to activate GeneSpring on the virtual machine (To surrender the Order ID: Go to Help -> License Manager -> Surrender).
When you want to switch back, you need to surrender the Order ID again.