I doubt that highly. Probably the stuff at the discount store has been in storage longer and is closer to code, or is even from a different batch and recipe, possibly even less product. We know from stuff that’s come out about WalMart that those are all favorite ways of meeting WalMart’s price demands, including in their grocery section. You don’t make 25% of the price disappear by magic, that means 25% of the cost had to go away too.
Packaged meat and canned goods, petfood etc are all brand name, slightly to greatly cheaper, and in case you didn't know, they have sell-by dates, so you know they are current stock. Vegetables are fresh--no way to hide overaged veggies.
The only downside is they don't pay credit card companies--cash or check only. And longer lines and less elaborate checkout areas. If you have the time to spend an extra ten minutes in line, you can save a bundle. They even have free plastic bags.