You’re going to get into the blurry distinction between a ripoff and a tribute or an homage.

Captain America: The Winter Soldier has a lot of Three Days of the Condor, but is that a ripoff, or an homage?

Ditto Star Wars and Hidden Fortress.

Fistful of Dollars and For a Few Dollars More were uncredited remakes of Yojimbo and Sanjuro, and as I recall Kurosawa was pretty annoyed, so that probably counts as a ripoff.

Oreo cookies came out four years after Hydrox cookies, and I’d say they surpassed the original.