I have recently upgraded from a late 2012 Mac Mini to a late 2013 27" iMac. I had previously upgraded the Mac Mini's memory to 16gb from Crucial (2x 8gb DDR3L-1600 according to the label on the pack). Obviously as there is 8gb in the iMac I would like to swap it with 16gb in the Mini. As far as I can tell they are compatible but just wanted to check on here first before I go ahead and swap them out. EDIT: As the iMac has 4 memory slots could I have my 16gb (x2 8gb modules) and add a further 4gb (x2 2gb modules) creating a total of 20gb?