I only had enough money to buy 1 pair of Corsair RAM CMU16GX4M2C3000C15. I wanted to buy another pair of the same to have 32gb total. The QVL lists both my current 1 pair and 2 pair CMU32GX4M4C3000C15 as compatible. Can I just buy another pair of my current RAM to make 32? or are there differences in the 1 pair and 2 pairs being sold? The specs for both have the same timing, voltage and RAM speed. Thanks for any help.