There is really no way the taste of something can be conveyed perfectly accurately. And until we have "Taste-o-Net" on the Internet, the best way for you to determine the differences is to bake a cake using a mix, probably a plain yellow cake (none of the butter-flavored, etc.) and bake a Bisquick one and do a a side-by-side taste test.
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!