Well, necessarily, the people at HLS have already performed excellently at undergrad whereas the UoL likely have not performed at that stage at all. That would, in my eyes, make HLS of a higher tier simply for having achieved more. You could say that they are equally intellectual, but the PG have achieved more, and I think that is an acceptable statement.
I am curious, however. You mentioned AAB and 2200. Are those equivalents, would you say?