The calculation of cardiovascular risk is a current need in the management of cardiovascular disease prevention day today but there are differences between them.
I don't think that there is an ultimate response to this question - depending on the ethnicity of the population, local dietary habits, and other factors not necessarily included into the risk calculation such as alcohol consumption, you will get different risks even if the key risk factors used for calculation are identical. For me, the Framingham study is still the most reliable basis - you can find an online-risk calculator at http://cvdrisk.nhlbi.nih.gov/.
You might be interested in the new JBS Risk Calculator that considers lifetime risk. Others differ because they are using different datasets with different parameters in different populations