
A comparison of apples and oranges occurs when two items or groups of items are compared that cannot be validly compared.
Found on
http://critical-gaming.com/critical-glossary/

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...
Found on
http://en.wikipedia.org/wiki/Apples_and_oranges

Apples and oranges is American slang for completely different things.
Found on
http://www.probertencyclopaedia.com/browse/ZAA.HTM
No exact match found.