Mozart and Wagner are as different as chalk and cheese.
if two people or things are like chalk and cheese or as different as chalk and cheese, they are completely different from each other
My father and I are totally different, like chalk and cheese.
Смотреть больше слов в «Англо-русском универсальном дополнительном практическом словаре И. Мостицкого»
ничего общего, похоже