I don't think so, several items are different in ways that could not be faked easily. Suck as, the base of the stolen one is in good shape. The base plate of the one for sale is rusted. Yes there are ways to make parts rust quickly. But most thieves aren't that savy.
I hope the owner finds his pump. I remember when my ATM card number was stolen and used to buy satellite service. I called the satellite company and tried hard to get them to give me the address that MY card had paid for, of course they refused. I planned to knock on the address front door with a baseball bat in my hands.
Michael