As far as I know, You Have Carrara Pro, and the Carrara has most functionality taken from Hexgon, but my guess is that Hexagon is far more superior in modelling than Carrara pro. I have bought Carrara 5, but I discovered that I missed some usefull functionality like edge on edge that is provided in the pro. So I made a choice, either upgrade to pro or buy the Hexagon. I went for Hexagon because I still believe that it probably contained more functionality than in the Pro. I can only say that I love Hexagon. :-) Now the confusion, is that some packages, Carrara 5 and Carrara 5 pro comes bundeled with Hexagon as separate program. So you have a choice, Carrara only or bundeled. You must understand that Carrara does not do any rendering at all! Just modellng. And it is now my main modelling toolkit. I just love it. :-)