Hi guys, Newbie here. I am considering upgrading the ram for my late 2015 i7 iMac. Could someone please let me know if there is a difference between the two sets of ram? If there is, could you please give me a little more information and which one to go for. The model numbers are CT7916286 and BLS2C8G3N18AES4CEU. I am also aware that Hyper X produce HX318LS11IBK2/16 but I have never heard about the company and most people advise crucial, so a little skeptical. Opinions please for which would be best for me. Many thanks!