apples and oranges

listen to the pronunciation of apples and oranges
İngilizce - İngilizce
Said of a comparison of items that are not comparable

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

mix apples and oranges
To mix two totally different things
compare apples and oranges
try to find similarities between two completely different items (or subjects, issues, etc.)
apples and oranges