The games I have seen Drouin throws himself around a bit more. I looked up their hgt/wgt on hockeydb.com after you posted this, they are same height and three pounds seperates them. The games that I have seen, about a half dozen it just seems to me that Drouin throws himself around more.
Mac is the more physical of the two. Drouin even admitted that he doesnt go out there and play that physical game, looking for the hits. And from all the scouting reports, that seems to be the most accurate, going against what you are saying. And Drouin is 5-10, while Mac is 6-0.