Turns out they are surprisingly similar. <grin> This research comparing apples and oranges is going to be a versatile tool in my rhetorical toolbox. I especially like the following meta/recursive/reflective observation:
First, the statement that something is like comparing apples and oranges is a kind of analogy itself. That is, denigrating an analogy by accusing it of comparing apples and oranges is, in and of itself, comparing apples and oranges.
3:51:36 AM