I've got two different tables of Holdem probabilities from sites on the internet and they appear to contradict on certain situations!

For example, one has an open ended straight draw completing by the river at 34% and the other has it as 31.5%.

One has a flush draw completing as 35% whilst the other has it as 39%!

If anyone out there is ABSOLUTELY CERTAIN that they have the correct probabilities for these two scenarios I'd greatly appreciate it, as it will probably show that one of my tables is correct on both counts and the other one should not be trusted.

Thanks,

Gattaca.