I don't think they did it in similar ways. Both teams got the "unsustainable" tag but if anything, what that team was doing was a bit more sustainable.
the 11-12 team literally outworked their opponents to victory. It didn't always look pretty but it was effective. It was very much their identity.
I don't think this team has that same motor. They don't have the same structure and they certainly haven't been built to play that way (with the moves today+the offseason, theres more direction towards how they want to play. It won't be Torts hockey but theres a vision thats coming into focus.) This team has heart and they've been pretty good when they need to be, but they've been in control FAR less than that team was. It hasn't really mattered who the opponent has been, they've rarely dictated the play this season (yet sometimes it comes out and they shit on teams... Even really good teams. It doesn't make a whole lot of sense to me because its there, but its been there like 20% of the time.)
But that was a much more veteran laden team. This group is still collectively pretty young and finding their way I guess.
Igor is having a better season than Hank ever did though which is saying a lot.