No they're not. All of the grocery stores are engaging in "white-labeling" - buying products from other manufacturers and putting their own label on them. It would maybe be a valid comparison if Price Chopper took in 50% of all grocery dollars spent in the US, saw what was popular, cloned those products in house and then used the top 80% of shelf space to prominently display their product, and moved the third party competitors to the very bottom shelf.

Additionally, Trader Joes ONLY sells white-labelled products, so it is even less applicable than your other examples.