IMHO, if the original tags are still attached to the original firewall, the car is what it is... if the tags are swapped onto another firewall, it's a re-body. So, if you cut the firewall off the Z and weld it onto another car, I'd consider that a Z.
This gets complicated when a car is severely damaged in the front, and the firewall is caved in, but the rest of the body is saveable.
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