A: It's all in the grip.
Beer nuts will cost you about $1.25. Deer nuts are under a buck.
Hazelnuts are normally around $1.50/lb, deernuts are always under a buck.
The grip.
A: Two: One to hold it one to hammer it in.
When you start them, they made the sound "runnnniganiganiganiga" Sorry for the racism, but had to share this.
Common Sense
They both blow and make different noises when you finger them.