Let's see if this example explains it. You want to buy some crackers. You want to buy (made up name similar to car seat issues) Crazy Cracker's Italian Cheddar flavor. You think you find it. Crazy Cracker's Italian Cheddar flavor, with "and parmesan" written in half size print under the words "Italian Cheddar". Other than that, the boxes are identical. On one hand easy to see, on the other hand, not obvious that it's actually a completely separate flavor. You ask to price match for a box of crackers, since the store down the road has the box $2 cheaper. Who are you going to believe gave you accurate information on whether it could be price matched? The person who doesn't look at the store listing on your phone of the Italian Cheddar flavor, simply scans it with his store equipment and says it's not the same and therefore can't be price matched? Or someone who says the UPC must match, helps you pull up the UPC on your phone, and then compares that to the barcode so you see with your own eyes that there's two Italian Cheddars?