The Birmingham sound (Hannah Wants, Tom Shorterz, Lorenzo) is more garagey as a rule - 'deeper', while the Leeds sound (Nick Hannam, Tom Garnet) is more electro influenced and 'dirtier'.
Some of the bass lines on this shuffling stuff do remind me a bit of jackin, though the drum patterns seem to have quite a bit less punch. Also in terms of sound scape, I feel the shuffling stuff is a bit more polite, classier, closer to international deep and tech house etc, with less of the 'ardcore silliness, big bate samples, general bad taste of jackin.
But yeah, obviously both scenes define as house, both scenes will go mad to Au Seve or Jamie Jones tracks, and rather than hard and fast boundaries what you have are kind of amorphous spheres of influence.
Hannah Wants has played a few big house raves down in London, and seems to have made a bit of a name for herself in the London house scene. Otherwise, as is usually the case, it seems that the London scene has very very little interest in anything happening north of Watford...
Also, if I'm gonna find the 'Shuffling' and new London house stuff I like, it seems easier to go via intermediary figures like Hannah Wants, whose own productions I love and whose taste is definitely towards the jump-up, banging, ravey end of deep house.