Yup, I would say they are different. That's why we belong to the forum to find this stuff out. There is always someone who knows. Let me ask this. Is it straight forward to rebuild a pump as I see kits for sale or would a guy be better off to buy a new one? In saying that I guess my experience with "kits" sometimes they do not get things back 100%. What is in one of these to where that needs changing?