Idiom - It's apples and oranges / Comaparing apples to oranges
 

A comparison of apples and oranges occurs when two items or groups of items are compared that cannot be practically compared.

The idiom, comparing apples and oranges, refers to the apparent differences between items which are popularly thought to be incomparable or incommensurable, such as apples and oranges.

 

The idiom may also be used to indicate that a false analogy has been made between two items, such as where an apple is faulted for not being a good orange.

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https://en.wikipedia.org/wiki/Apples_and_oranges

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

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