Simplest thing to do is to copy the VM bundles from the current mac to the new mac; and then open the VM bundles from the new mac after copying is complete. You could just use an external USB SSD/HDD for faster results to copy between the new macs for faster results; copying over the network would likely be slower.
For Windows VMs, just make sure that you answer "I Moved It" instead of "I Copied It" so that it will not require licence reactivation. Sometimes reactivation will require re-entry of the Windows licence key.