Sort of. At most (maybe? All the ones I've looked into, at any rate) unis the boundaries are always the same, in terms of the number on the final score list (so if it says 68% on the sheet at the end, you've got a 2:1), but those numbers aren't necessarily actually percentages, and don't map exactly to the marks that you get, and they rescale the marks accordingly. This can lead to some weird things ("wait, I got more marks on that exam than I attempted", and so on), but it works.