Okay I was thinking about this. I am assuming you feed a kibble to your dogs. A 8 oz cup is a half a pound, so a full pound would two cups. So 2 pounds would be 4 cups of food. I am pretty sure your huskies would be able to eat 4 cups ( especially the two of them) without too much distress. I would however, as I am sure you already skip dinner, and maybe only half a breakfast if that.
Cat food is higher in protein too, as richer as someone stated. Short of having gastric upset because of a " change in foods" and the higher in protein of the cat food, I would think they should be fine.
How are they today by the way??