Hi,
It doesn't matter att all. You will never be able to notice any difference in your system
The memory's you linked to have different timings (not only Cas Latency).
More important is the voltage of these and what system (processor) you are going to use them in.
Intel for example has clear recommendations: All Intel Core i3, i5, i7 of second, third and forth generation should only use 1,5V +/-5% memory, higher voltage will put more stress to the processor and it will shorten its life span.
Memory's of the fifth generation "Skylake" for an example have two different types: DDR4 max 1.2V and DDR3L(Low voltage) max 1.35V
Never exceed this if you like your processor to last.
Of course some overclocking will per nature means also overclocking of the memory, but as all OC - it is on your own...
Best Regards from Sweden