Can I trade my iPod Nano 6th Generation in for a iPod Nano 6th Generation 16GB?

Hey guys.

So im getting my iPod Nano 6G from Apple because of the 1G Replacement Program and was wondering if the iPod Nano I get back which is told to me buy an Apple emplyee to be a silver 16GB Nano 6G in for a 16GB and pay the difference for reicin=vng the greater capacity and the headphones and the dock connector and ALL the other good stuff you get with all the iPods. Thanks for helping me out.