The CPPro comes with the acrobatic kit installed--symmetrical blades, heat sinks, a different motor pinion, a LiPo battery.
It also has a separate receiver and 3-in-1 unit, where the CP has a 4-in-1 and a NiMh or NiCd battery pack.
The CPPro has a Bell-Hiller head standard, this is an expensive upgrade for the CP.
The CPPro has cooler decals.