No, it's because it is only the partial truth. For normal products, the model numbers are different because they want to eliminate price matching and the vendor does not want to deal with companies bitching about special pricing. HP used to do this years ago with Sam's Club. They had the HP 722C printer, but at Sam's club it was HP 720C. They were the same printer, but they sold the 720C for $50 less.
At the moment, I work for one of walmart's biggest suppliers (trust me, it is not a good thing). Stuff may be different model numbers, but they are all the same product found in different stores. They only time you may get a different product is when you get those mysterious black friday models....you know, the models that show up with no history of being sold ever. Those models could be little differences from taking away certain accessories to something big like taking an electronic function away.
While it may be true quite a few "normal" products are indeed the same in WM as other stores, some products tend to lend themselves to be cheapened in their construction, giving WM the leverage to request a lower purchase price vs. BB.
Case in point.....having worked on numerous HP/Compaq computers purchased from WM over the last 12-15 years, early on and into the last decade, I noticed distinct internal build differences between the same exact model numbers of computers sold in WM vs. BB/CUSA/CC.
As the model ended in wm for the WalMart version of a model while the BB/CC/et al purchased models would end in another pair of letters, it was easy on HP's/Compaq's website to look up parts, which I often had to do or would do while looking up drivers (the owners invariably lost the original CD...)
And while the BB/CC model would be built with at least name recognizable components (motherboard by Asus, for example, or hard drives by Seagate or WE, memory from Samsung/Crucial/Kingston, etc., etc.), the WM purchased models would have off-brand and sometimes unrecognizable brands of parts, such as TriGem motherboards, hard drives from unknown Chinese "makers", memory from unknown makers....that is iff the memory was actually labeled by the manufacturer for anything other than capacity, speed, and the HP/Compaq part number.
And I saw this more than a few times.....cheaper components in a WM model when compared to an identical BB model of the same computer. I can only imagine that the guts of a TV can be as easily compromised and the consumer wouldn't be able to tell, at least initially.
Of course, this is just what I found on HP's website and from what I've seen inside them, but compromises between the two most definitely made the WM product different.
And also consider the story about Snapper mowers and its parent company, Simplicity. WM used to sell Snapper mowers in WM and had great success. After all, Snapper is a well regarded brand of mowers and they moved a ton through WM.
But WM demanded a lower purchase price every year and the margin left to Simplicity per unit was getting so slim it was just above break even. So, the CEO of Simplicity went to WM's headquarters to drop distributing his Snapper mowers through WM.
During the discussions, the WM CEO suggested that to boost margins for Simplicity on the WM sold Snappers, the WM version's construction could be outsourced to a cheap Chinese manufacturer, and with that combined with using cheaper parts, the margins would increase for Simplicity and WM could continue to sell the Snapper name, since that's all WM really wanted was the Snapper brand on some sort of mower. (Snapper mowers are all built in the U.S., btw.)
Thankfully, the Simplicity CEO didn't fall for it....something about the brand meaning something.
We won't talk about the look-a-like Levi denim jeans WM sells. Look almost exactly like those in other stores, except the denim's of lower quality and thinner, zippers are lighter and cheaper, etc.
But the upshot is, there can and are differences between some WM sold items and the "identical" item sold in BB or by Amazon, etc. And I'm sure with paper towels, Purina dog food, Land 'o' Lakes butter, Tropicana orange juice, Folger's coffee, and a wide host of other products, WM does indeed sell the exact same thing as other stores. But in some things....not exactly.