Of course but if the shoulder is shorter it no longer goes all the way through both the hub and rotor surface. Clearly the lug nuts get torqued down and provide a lot of clamping force but there is a small margin where there is no contact. Splitting hairs? I dunno, that's why I'm asking here.
Lug nuts may also pose a problem with the longer studs, have yet to find a long shank, open-end style with a metric thread. I have 7/16-20 closed end right now which I would not be able to use with the longer Aussie studs. Probably is something out there, likely just haven't looked in the right places yet. I imagine that will be less of a problem than getting the stud itself.