As
@Dragonsbeard noted, one of the tricky things with notes, is there is a lot of difference between them. Even something basic like lavender can have a wide range.
Add to that how accords work, which is where scents blend together to form a very different scent, similar to how mixing blue and yellow give you green.
And finally, this holds true in perfumery at least, the notes are not the same as the actual ingredients, which aren't generally listed. So a fragrance might list a note, but there isn't any of it actually in the fragrance, it can just smell like it is.
After a while, I've found that I just use note pyramids to get a real rough idea of where the fragrance is going, but never expect it to smell like I think it will based on the pyramid.
It's like music, you can like rock, or jazz etc, but that doesn't mean every rock album is the same, every band has it's own take on rock.