iVape, I believe you have ultimately to try them out to really get the difference.
One aspect of the chemical difference is that neither of those FA flavors you listed have butyric acid, whereas both Cap Butter Cream and Cap Sweet Cream (presumably) do. (Not, apparently, DAP, though!) Oftentimes people perceive FA creams as having a "dryer" flavor. I have recipes where I prefer the FA Creams (Vienna and Fresh) to other brands, and some I like with Cap or TFA creams. There is something fresher and more authentic to me about FA creams, generally.