Trying to fit iMac 27 Late 2013 memory into iMac 27 Late 2009
Specs say that the 27" late-2013 RAM is 204-pin PC3-12800 while the late-2009 RAM is 204-pin PC3-8500. When you physically compare the RAM carrier boards, are they identical in height, width, thickness and indexing guide slot locations?



Red arrows are index guide slots.