I can offer a size comparison photo I posted a while ago on twitter for a friend:Edi said:Is there any comparison?
http://twitpic.com/6qzw1u - Young Animal, MBR and regular release on top of each other. It may seem that they're not lined up properly, but it's only because of the angle.
As for the print/paper quality etc. it's pretty much similar. Only the cover quality really sucks in comparison.