I believe all pans from 2006-current are exactly the same, but I'll check part numbers on Monday. From the picture it looks the same, but I'm going off memory. There are some very small changes from 2005 to 2006, but nothing significant. If I were buying one new I'd get a 2006+, but if I were shopping used I wouldn't pass up a pre-2006 if the price were right.
Here are pan weights:
EJ20 pan: 5.1 pounds
pre-06 EJ25 pan: 3.9 pounds
post-06 EJ 25 pan: 3.6 pounds
Killer B Aluminum pan: 3.8 pounds
Keep in mind our Killer B pan also holds another quart so full, it should be the heaviest.