Being a fan of the Audeze pads I would say the NH / NO pads could be a little thicker (which is why using the "fast foam" will be the better choice .
I think AQ went with the thinner pads & memory foam so as to be more attractive to the portable audio crowd ! (A lot of them seem to be a bit self conscious of how sporting more robust headphone proportions will appear; the NH / NO earpads strike me as being a bit conservatively sized ; & then it struck me why they decided to go that way) (& it had little to do with headphone performance)
So, same size as stock? News Flash! Just got an email from Vesper and handmade to whatever spec you want is $62!!!