It depends, IMO, on how the rest of the match pans out and the position that the player plays.No chance. A player like Dangerfield is worth a couple of goals on average. These differences are a matter of points, if that.
Ruckmen in particular can be worth a hell of a lot or worth nothing, depending on the quality of your clearance players. If we'd managed to even up with McEvoy last week, the game would have looked substantially different. Swapping Murdoch for Parsons is worth very little IMO.