Store brands are not necessarily equivalent to the name brands. The stores buy the product from different manufacturers, so each batch of a store brand solution could come from a different manufacturer. Your best bet is to go with a brand that your eye doctor recommends. Give him/her a quick call for the best results.
truth is it’s hard to say- but just to be on the safe side if I were you I would go get some OptiFree solution instead - not worth the risk that Walgreens stuff is really Renu in disguise.