Overclockers, help me choose ram

File: ripjaws.png (766KB, 1125x750px)

766KB, 1125x750px

Building a new pc. Settled in on an ASUS Maximus IX Hero Z270 motherboard. I'm also going for G.Skill ram. The G.Skill website has a neat ram configurator page. Drop-downs ask me to choose my motherboard manufacturer, chipset, and model. It then provides a list of compatible ram.

Before I began this process, I had already chosen to go with 8GBx2 DDR4 3200MHz Ripjaws V for no reason other than affordable price. So, I looked down the list G.Skill provided to find Ripjaws V models. Here's where my lack of knowledge failed me. I did indeed find 8GBx2 DDR4 3200MHz Ripjaws V, but in fact I found four of them. The difference among them is their CL number. I sort of know what that is but I thought it was tweakable. I do not know enough to know why I would choose one over the other.

http://www.gskill.com/en/configurator?manu=29&chip=2859&model=2866

These four are all Ripjaws V 8GBx2 models that G.Skill says is compatible with my mother board —
DDR4-3200 (PC4-25600)
16GB (8GBx2)
CL14-14-14-34
1.35 Volt

And here is another —
DDR4-3200 (PC4-25600)
16GB (8GBx2)
CL15-15-15-35
1.35 Volt

And yet another —
DDR4-3200 (PC4-25600)
16GB (8GBx2)
CL16-16-16-36
1.35 Volt

And one last one —
DDR4-3200 (PC4-25600)
16GB (8GBx2)
CL16-18-18-38
1.35 Volt

Why are there four different CL models? Are they the exact same sticks but simply come pre-configured and thus can be re-configured if I choose to do so? Or are they distinctly different thus requiring me to me an informed choice?