There is a huge difference between Cherry MX Blues and Cherry MX Browns. [1] The amount of sound they make drastically differ, and they have very different amounts of tactile feedback. Even if you gave somebody who knew nothing about mechanical keyboards a Filco Blue and a Filco Brown, they would definitely be able to tell the difference.
------------------------
1. http://geekhack.org/showwiki.php?title=Cherry+switches+and+b...