THE DIFFERENCE BETWEEN XII

What's the difference between:

1. A professional fighter and a man proposing marriage?
2. A mission to save someone and the cafeteria line on a military base?
3. A surcharge on alcohol and tobacco and sentence structure?
4. A chef in an Indian restaurant and a lobbyist?

Answers:

1. One boxes in a ring, and the other has a ring in a box. 
2. One is a rescue and the other a mess queue.
3. One's a sin tax and the other is syntax. 
4. One uses curry flavor and the other curries favor.

Credit: #2
The Enigma - May, 2010
National Puzzlers' League Magazine
VRAABY 

Credit: #3
The Enigma - June, 2011
National Puzzlers' League Magazine
EGO

Credit: #4
The Enigma - Feb. 2012
National Puzzlers' League Magazine
EWOLF