I'm a twin.
1. Don't dress them in matching outfits. It's nice when people call you by your name, not your brother's name. Different clothes help alleviate that.
2. #1 most asked question: "If I pinch you will your brother feel it?" Answer: no
3. #2 most asked question: "Do you guys try to play tricks on people, and switch girlfriends?" Answer: no
Congrats on the boys. They each have a best friend for life!