So, Robert McNeill played Nick Locarno in TNG, a guy that attempts a dangerous stunt, gets discovered and sentenced, and has to atone for his mistakes. In Voyager he's another character, Tom Paris, who was in prison and has to atone for his mistakes.
So... why a new character? Why not make Nick Locarno the character of Voyager as well? Same actor, same general backstory, same broad strokes personality... and being just a one-time character, he was not that developed, so the authors would still have plenty of room to do whatever with him. Friend of Harry, holodeck fan, the issues with the Maquis and Chakotay, the romance with Torres... all that could have been added to Locarno, hardly contradicting anything from the TNG episode.
So... why a new character? Why not make Nick Locarno the character of Voyager as well? Same actor, same general backstory, same broad strokes personality... and being just a one-time character, he was not that developed, so the authors would still have plenty of room to do whatever with him. Friend of Harry, holodeck fan, the issues with the Maquis and Chakotay, the romance with Torres... all that could have been added to Locarno, hardly contradicting anything from the TNG episode.