There's no end to how many saws will work. Here are a few things I look for:
a blade long enough to go from side to side and allow for sawing action without the tip going inside the head. A short saw will work if you saw 1 side at a time but that's too much work.
fine teeth. Those wood teeth will work but a fine tooth will work better
no back. It needs to be able to go all the way down through skull without hanging up.
The saw Bambistew posted meets all 3 even though it's bigger and heavier than I like for elk hunting.
