This was my problem in thinking about it. Trying to seperate the guilt into just one, I could only come up with a method of physicality; they have the same minds, motivations, memories and so on, so the difference must lie in that it was not that particular version that did the deed. But by that logic, killing the original destroys the guilt, and what’s more if instead of a copy the mind is transferred into the clone, likewise it could be argued that the guilt is gone too, as the physicality is just as different.