I think the most significant difference between the two kits is that the K-2006c kit has a larger quantity of the reagents which would have nothing to do with accuracy.

Check out these links.

http://www.taylortechnologies.com/pr...asp?KitID=2230

http://www.taylortechnologies.com/pr...asp?KitID=2235

Someone please correct me if I am wrong.