My main PC has 2x4 2666 DDR4 CL15 memory modules installed. Decided to add extra 2x4 to total of 4x4. I found same exact manifacturer, same frequincy and capacity memory, but it is labeled as CL16. CPU is Ryzen 5 2600, quad channel doesn't work, but it registers 4 modules as dual channel if it's plugged in correct way. Can I buy CL16 even though system has CL15 ?