are you sure? I'm not comparing the two.......but i've been in full control in beer leauge and been ahead of the puck ( ass first dragging the puck ) and i get called offside all the time.
Don't know what rules you use or if the refs are aware of it, but if you look at the nhl rule book one of the sections under offsides states that you can cross the line before the pick if you have possession. I've seen NHL refs mess up this rule before though