I really don't know the answer to that question, but I guess they could. Although the question bank is originally the same, the countries remove questions from it that they think are flawed. They are also known to "play" with the questions, that is changing the question a little, just so that if you know the question from the question bank your school gave you, you mark it wrong because of your over confidence.
It would be nice to get you results the same day, even if they are only temporary. I am still waiting for my January results - I estimate that I will get them in just over a week...