Depending on the city pair a lot of revenue pax get on the upgrade list at the last minute. I do not want to sound negative but this figure does not really good. To me there is a great chance that this flight is already oversold. I sincerely hope I am wrong and you will make it.
To answer your initial question, yes carrier have different policies QF for example would never do it and as Migflanker says the faces of myidtravel are not reliable.
Good luck.