DN vs DC -- right now at pokerroom.com

[sweetjazz]

According to DN, they have played 2376 hands and DN is up 73.2 BB. Assuming that the rake is zero (at less than 0.05 BB/100 per player it's pretty neglible), with what confidence can we conclude that DN is the better player?

A 70 BB downswing is relatively common, especially HU, but it would be interesting to see what the numbers say. I am unfortunately too ignorant and too lazy to do the calculations myself.