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@WilliamJohn
Different model, the longer one is Series 2, but the shorter one is an Evolution, I've got the evolution and the Series 2, evolution is a fair whack stronger, better quality and comes with most importantly a key with a light! But yea, better quality and the shorter the lock, the less empty space someone can get a car jack in to get 'em apart.
But in short, better quality lock.