Can I get the white macbook replaced with the black macbook?

Hey I am using black macbook and its looks nice and come with a bigger hard drive. Plus, even if you get the .there is not that much difference in both of them but you will find that black macbook comes with 160 GB hard drive and on other hand it is 120 GB hard drive in white macbook. Black mac will cost $1649.00 and the price for white mac is $1449.00. So as there are some more features in black macbook and that is the reason that you cannot replace white one with the black macbook. Yes you can upgrade your white macbook and upgrading the white macbook to a 160GB hard drive brings the price up to $1531.00.