I just read "Sins and Mistakes" by Dallin H Oaks and he stated "A deliberately wrong choice in the contest between what is clearly good and what is clearly bad is a sin, but a poor choice among things that are good, better, and best is merely a mistake. I cant relate it to Adam & Eve though because it wasn't a choice between good, better and best, it was a choice between bad and impossible. His talk was on Sin vs Mistakes, not Sin vs Transgression. He also stated "that is generally a matter of error (mistake) rather than transgression (sin)." So right there he is using the words 'sin' and 'transgression' as having the exact same meaning.