The difference is minimal. He is using 1-3-1 zone as defensive tactic land he is at home. Stamina can be always the villain:) - and your starting center played more minutes than his, could be potentially more tired. And last and not least matchups - you lost battle for rebounds at SF spot by a big margin that I would that it wasn't caused just by a bad luck. On other positions luck+home court could be a factor.