I have both, this one is very similar to the other. The one at NB will have a plug that the refrigerator plug will plug into, the AS&S one will have some electrical crimp connectors like this: http://www.radioshack.com/product/index.jsp?productId=2104091
, which on my kegerator happened to be the exact ones on my compressor. Besides drilling the hole for the bulb it was a two minutes electrical connection.
The AS&S one might not be in as nice of condition and might be missing a screw or something else. It helps that they have a retail store locally and I could test them and pick out a few with better, at the store some of the copper capillary's were a little uncoiled and a few were missing the screw holding the body together.
I'm not sure about the NB one, but the surplus one can always be easily wired to turn on below the set temperature. This will be nice in the winter in my basement.