The word “lorsque” implies that it is not possible to imagine a circumstance. It is different too. It is the same event whether it is “si” or “lorsque”.
If there's going to be a vote, then the key difference would be if it wasn't mandatory. “Shall” and “doit” are much more important to the sense of the paragraph. But I'm not a linguist either, and I think the objections can.... But as a matter of statutory interpretation, I don't see how there's a different result.