apples and oranges

• apples to oranges

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apples and oranges pl (plural only)

1. (idiomatic) Said of a comparison of items that are not comparable.

   It's apples and oranges. You can't convert square meters to linear inches.

   Comparing the grades of English students to those of engineering students is like trying to compare apples and oranges.

2. Used other than with a figurative or idiomatic meaning: see apples,‎ and,‎ oranges.

• chalk and cheese
• night and day, day and night

• apples to apples, apples with apples
• apples to apples, oranges to oranges
• oranges with oranges (rare)

• mix apples and oranges

• like-for-like