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I'd guess Puller II is the second version
http://www.nwsl.com/Brochure%20Pages/broch%20454%20Tools.htm
For the extra 10 bucks getting the Puller would cost, I'd say its worth it to have both the basic and II model along with the 2 smaller sets of adapters, especially in N-scale where the standard size puller end is larger than any axle or motor shaft I've ever seen on any N-scale equipment.