ORIGINAL: Top2874
The Blade CP can not fly inverted straight from the box. You will need to purchase the upgrade kit and a more powerful battery. The Blade CP Pro can fly inverted with no upgrades... once you upgrade your Blade CP to fly inverted, you only need to upgrade the "Bell Hopper MIxer" and you will have the same thing as a Blade CP Pro.
It's Bell "Hiller" although hopper is probably more appropriate
and you also won't have the 3-in-1 and separate receiver, but that's just being nit-picky.(Even if it's a huge improvement over the CP one). And another note: the CX is smaller than the CP.