Longo needs to do a study using animal fats with his protocol. I don't think we can assume it would be the same, better, or worse. But the suspicion, since the theory is that proximity to the fasted state--that is, not eating a whole lot, especially of insulinogenic foods--gives the measured benefits, should certainly be that you can approach fasted with animal fats as readily as with plant. I know in my case, just butter in coffee feels an awful lot like fasted, but without hunger.

As far as the profile of the fats you're burning for energy goes, the animal fat might even be closer to your body fat in content of various fatty acids, in case that matters.

Higher quality animal protein might be a problem, making the effective protein intake higher if you keep it to the same number of grams. I think not bothering with the carbs might make up for that.