The big difference IMO was Perk played less minutes last night and when he was out he was in sets to help cover him whereas in Games 1 and 2 he was getting abused in the pick and roll by Ginobili and particularly Parker but the Spurs will work out how to get what they want against the Thunders smaller set before long and also the play of Westbrook was influentual and will be a big factor for the Thunder (as ever) as the series progresses