http://www.virtualizationadmin.com/kbase/VirtualizationTips/DesktopVirtualization/VMwareWorkstationTips/ManagementAdministration/UnderstandingtheMovedItorCopiedItOptioninVMWareWorkstation.html

I think it also, but could be totally wrong, gives the NIC a new MAC as well. I’ve had it before where two VMs would boot fine, one copied from the other, but one of the VMs NICs refused to work unless the other VM was off. I finally realised they both had the same MAC address. That was a few years ago, until before I discovered Workstations own “clone” option.

http://techhead.co/vmware-esx-i-moved-it-or-i-copied-it-whats-the-difference/