This year is a possible game changer though for the trend though. Over the last few years the last distance admitted has gradually shrunk, but this year CEM ran the exam. The broad view is that CEM is harder than GL, meaning less applicants would have passed than traditionally, and so the distance to admit from may well have expanded. But, some of parents going for the Sale exam may have thought to check the AGGS box too, in for a penny etc, and so the cohort size would have been greater. A bigger pool would likely mean more passes, and therefore shrinking the distance admitted. The two may offset each other, meaning the current distance would stand, but who knows.
I don't think it works that way.
It does not matter if the exam is GL,CEM or A level-the pass make boundaries are adjusted accordingly, they simply draw a line at about 30/70 split, the top 30% or so pass the rest do not(the assumption here is approx. the same candidates will come top in CEM as would have come top in the GL) then its just about distance.
I doubt there will be much difference this yr(most Sale girls have always done the AGGS 11+ , for practice, if for no other reason-since AGGS always comes first)