Use 2014 materials to study 2015?

I’ve looked at all of the reading headings and found 2014 to be a very close match with 2015.  Not sure if the same reading headers necessarily means that every LOS is the same but I’d imagine complete overhauls to be rare.  I’ve contemplated the same and think I’ll use 2014 material for level 3 myself. I’ve used out of date material at every level so far and have yet to pay for it with a failed attempt.  Just use the core curriculum for the odd reading you don’t have.