Nope – his character was “Cadet First Class Nicholas Locarno” when he was an extra in the TNG episode.
Robert Duncan McNeill Filmography
They have had some actors that have played multiple extra characters as guest appearances. I guess when they were casting for Voyager, they auditioned some folks that had already played extras in earlier episodes.
Tim Russ also had a guest appearance as another character on DS9 in season 2 (“Invasive Procedures”) – before Voyager began.