A comparison of two unlike things or people. Oh, you can't compare those two companies, that's apples to oranges.
apples to oranges
and A2O
phr. & comp. abb. [but that’s comparing] apples to oranges; [You are] making an unfair comparison. Chevvies and Beemers! That’s apples to oranges! They’re not even in the same class! It’s A2O! What can I say?