pc4-27200 4000mhz or pc4-28800 3600mhz

Solution
If you take a good look at the 4000 its not 4000 but speed(Velocidad) 3400. Also it has high latency CL19 so dodge that RAM. The 3600 does have the correct specs.

IceAgeComming

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Jun 2, 2017
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Based on this:
https://www.toptengamer.com/best-ram-amd-ryzen-5-7-cpu/

I was initially going to buy the 3600mhz but I noticed 4000mhz is cheaper. I know I might get only 2933mhz or whatever due to mobo's limitations. I suppose my question should be: are these memories both Samsung b-dice?