If you try and buy one from the Norwich website the price is £36. That suggests they may have been given at least some of E1H and that they have sold out of their allocation behind the goal.
I am a bit surprised by Villa getting an extra allocation to be honest. Sales seem pretty strong for this match. Only just over 1000 left on sale at the moment and there is still over 3 weeks to go. I suppose they will release various seats they have held back for club use and the school shelf...
On a similar theme there are only 1100 tickets on sale for Villa at the moment and they have sold all their 2700 tickets so that's looking even more likely to sell out than Norwich.
https://www.avfc.co.uk/News/2016/10/18/brighton-allocation-sold-out