A huge chunk of people should be able to identify both Mario and Donkey Kong. I'm sure a good chunk of people would say that's Peach and not know it's Pauline.
In addition to the Mario movie using the imagery not to mention a returning Smash Ultimate level for more recent examples, Mario Odyssey sold 20 million plus copies or something and one of the biggest if not the biggest setpiece in the game, the New Donk Festival, is a gigantic tribute to arcade Donkey Kong. I think people generally can identify Donkey Kong's arcade roots. Nintendo regularly does a great job of honoring and highlighting it.