Who knows...
But i heard from people that already passed the real exam last year that they're quite similar (i mean schweser and the actual exam), and some guy posted a little summary of what he thought were the probabilities to pass given your score on schweser practice tests. It was last month i think, but here's what i remember:
Score -> Probability to pass:
90% -> 100%
80% -> 95%
75% -> 85%
70% -> 75%
Don't know if these predictions are correct, but he seemed to be quite certain of what he was telling...