Officials don't work games based on conferences. In I think every series to date, there hasn't been an officiating crew that has worked more than two games in a series. Referees are grouped in pairs in playoffs and so are linesman, but they can work a game in Vancouver and later in the week work one in New York and then go to Phoenix for the next game. Also, they are graded individually not as a pair.
So do you think they rotate Round 1 officials on the east coast to round 2 where they have to work west coast games?
the best way to to keep them from having favorites is by rotating them east to west/west to east each round.
I hope they do that, but I'm not sure?
In the last few years, there have been more refs living in the West. I think the league has adjusted regular season schedules to take advantage of the costs savings. In the playoffs, I think I have seen Western crews reffing in the Eastern games.