From that article, Manu should be the difference:
Ginobili's presence will probably be the most important. On Dec. 25, San Antonio's swingmen (Barry, Bowen and Finley) combined for 15 points on 6-for-17 shooting; Ginobili averages 15.5 points. Ginobili is having an off season from 3-point range, hitting just 32.4%, but still will help stretch the Detroit defense after the Spurs shot 2-for-7 from downtown in the first matchup.