Can’t say for sure if my circumstances are the same as yours, but here it depends on the store and the product.
If you go to a grocery store, for example, chances are they’ll have a few generics for the same type of food. Usually there will be at least the standard, an organic/natural alternative, and maybe something really bottom line. And then of course varietals of a given product, like different types of bread, which may have different “brands” despite all being from the same supplier.