I think we can bet that the overall shape/mounting points of the 2013 headlight is the same. It looks the same to me, just different internal design.
It's inexpensive and cost effective for a manufacturer to refresh a model with bumper cover, grille and headlight/tail light layout, but it gets expensive when they have to re-engineer or redesign too many parts. The chassis, fender and hood metal stampings, and possibly the tooling for assembly, would all have to change if the headlight were really different.
I am interested in this as well. Does anyone have a shot of the 2013 with the DRL's on? Are they LED's?