Different-as-chalk-and-cheese meaning

(UK, simile) Two things that are different, particularly two things that are superficially alike but very different in substance.
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Origin of different-as-chalk-and-cheese

  • Attested in variant form 1393. The surface of some cheeses, particularly unaged ones, looks similar to chalk – white, crumbling – but in substance cheese is soft, while chalk is hard.

    From Wiktionary