The Panopticon/Mark Seven

Is there a reason for Mark Seven and [[Mark Seven (The Destroyers)]] being considered two different individuals on different pages? Given that he's an android, it's feasible to assume that Mark Seven simply went from being an SSS agent to being and ADF agent, even if it took place over different centuries. Sure, Terry Nation reused a character he created for a different story, but it's no different than Sara Kingdom being used in both The Daleks' Master Plan and The Destroyers. There's nothing in either of the stories that indicates they can't be the same character.