I can't type in a CLI copy all DH0: to DH0: without any confusion.
I could also give the logical name HD0: instead to the new disk, but i prefer to clone properly to not confuse paths and assigns.
Well, Copy all DH0: to DH0: wouldn't give you anything good anyways. If you keep the same names for the drives one of them will still be called DH0: and the other will be called DH0.0:
As for confusing paths; what's there to be confused about? As long as you can load to Workbench one time, you can change the drive name and reset, and you are all set. You could even to it with the Install disk if needed.