The different model number may indicate a store specific version of that model. There is an appliance company I'm familiar with that has a reputation for low quality products even though they sell the same brands as everyone else. Sure enough, the model numbers of the versions they sell are slightly different to everyone else.

On a similar note, when buying a scooter for my daughter, I found the "same" scooter in Toys-R-Us and Walmart. Despite identical branding and packaging, the Walmart version was of noticeably poorer quality (different materials and so on). I didn't check model numbers / SKUs, but I would expect them to be different.