Which is Which?

can anyone tell me what the difference between these 2 throttle sensors is? One is on my old engine and 1 is on the replacement. Should I just swap my old throttle body onto the new engine?

http://img526.imageshack.us/img526/8535/s4010084mo7.jpg

http://img526.imageshack.us/img526/8903/s4010081ah2.jpg