Apples and oranges have a lot in common.
Both are round, roughly the same size. Both are classified as fruit. Both have inedible seeds on the inside. Both are colored with red to some degree. Both are frequently juiced. Heck, you often find them near each other in the supermarket.
If you need to express how different two things are, maybe try apples and basketballs. Or apples and aluminum siding. Now THOSE things are different...