Bashir, Ross and the conference delegates were traveling on an Intrepd-class starship. As a result, we get to see them use the Voyager sets in this episode.
LOL, something similar happened to me when I first started watching TOS decades ago. When I first watched "Tomorrow is Yesterday", I thought they put on some other TV show because the episode started with scenes from a 1960's Air Force Base. It took me a few minutes before I realized it was Star Trek. 😉
Luther Sloan is back like a boss
Julian, into the fire he will toss
Koval is most unpleasant
At a tribunal Cretak is present
Not such a nice guy is Ross
Koval, the Chairman of the Tal Shiar, was portrayed by John Fleck. He will return to the Trek franchise later on ENT, playing Silik, the leader of the Suliban.