Yes, the same applies to a double minor. On a game sheet, a double minor is actually recorded as two separate line items. A double minor to a player on team A can be cancelled out by minors committed by two different players on team B at the same stoppage.
That could have been the situation in the original scenario. The player could have received a double minor for a single infraction or it could have been a minor for roughing and another for unsportsmanlike conduct. Either scenario would be recorded as 2+2.
In adult league, I’m happy as long as the opposing center isn’t turned 90 degrees and one of their wings isn’t closer to the face off dot than the ref. That feels like a low bar, but still very, very hard to meet.