Even though I wouldn't mind comparing the two, I'd feel bad taking advantage of Amazon like that, considering they did quickly send out a second one after their staff mistakenly deemed the first one lost. Perhaps if there was a way to easily open and reseal the box, but sadly, I know the Kindle box can't be put back into "as new" shape.
But if for whatever reason the one I open has some terrible problem with it, you can bet I'll open the second one too.
-HM