Hi, I have same question, and I think its not fully compatible, I tried to put 2014 display on 2015 and its have issue with backlight at startup, for example if you press "ALT" at startup to chose startup disk, screen remains all the time dark only with flash light you can see its working and if you chose disk and only after some 5 seconds backlight will turn on, if I put old original broken display but with working backlight it will turn on backlight straight with the "chime" and yes with new 2014 display its not lighting up straight after chime only after some 5 seconds or so, but after that works fine.