I was a field service repair engineer for years. I worked on many different types of equipment. Manufacturers will and do build a product with identical model numbers, but put different parts on or in them for different customers. When you go to order parts for these machines, you have to specify the serial number, not just the model number. The computerized database is how they determine what piece of equipment was built with what parts, even though the model number is the same. There can even be a wide variance of a part with the same part number, depending on what customer they built it for. It really is not difficult at all for a company to deal with the same model number with different parts in it. It happens every day all around the world.
Case in point, I own a John Deere 790 MFWD. It is the 30 HP version as I bought mine back in 2001. About 2004 or so, they changed the engine in it to a 27 HP Diesel. They also made a 2 wheel drive version of the 790 for both the 30 HP and the 27 HP. All of these tractors had the same model number. When I go to get a part for it, you can bet I have to give my parts guy the serial number of the tractor so he can order the correct part. If I send my wife to the dealership and she just tells the parts guy I have a JD 790 and I need a new front left wheel bearing for it and a rear main seal for the engine and she doesn't have the serial number to differentiate which version I have, she will be coming home empty handed with no order placed and I will be unhappy.
I worked on JLG man lifts. Home Depot tool rental would purchase a large number of lifts every year to go to their rental stores. These lifts were built basically the same as any other T350 lift, except Home Depot specified to JLG that they wanted certain modified parts put on these lifts. In looking through the parts catalog, if you didn't specify the serial number along with the model number and just ordered the general part from the catalog, you wouldn't get the correct part. JLG manufactured T350 lifts according to ANSI specs and they also manufactured the same T350 lift that went to nations all over the world. They all had the same model number, but the parts were different depending on where these lifts would go to.
What about automobiles? Same model, but if you buy it in California, it will have California emissions on it. Better tell the parts guy at the parts house your VIN number so he can get you the correct part for the engine.
I say all of this to let you know the key to what version of any equipment you have or what parts are in it is "the serial number".