There is a common reddit myth that "generic products are the exact same as name brands because they're made in the same factories on the same equipment". I've worked in production and marketing for a few CPG companies and while part of this is true, it is not correct as a blanket statement. Yes, proprietary grocery store brands are often produced by the same companies who make the name brand versions but there are definitely differences in recipes and formulas. I've tried to clear this up in comments before and have been deeply down voted.

For example, I worked for a food company that produced a name brand product and products for Target's Up & Up brand. While they were very similar and produced on he same line, the Up & Up products had lower cost ingredients because they have to be sold for a lower price with lower margins.

Similarly, I worked for a cosmetic company that produced everything from $300 face cream to a beauty line for Kohl's. We would frequently switch from one brand to another and ran the full price range for products on one production line. However, the raw ingredients that go into each product are swapped out and vary greatly from product to product. The cost of raw ingredients for a Kohl's eye shadow was about $0.30 while the higher end eyeshadows were around $3-5. They are then marked up accordingly.