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I think it is from genus Russula.
Most Russulas also get paler with age.. so cap color alone isn't always the best indicator of species
I think those are different species. First one is probably Russula cyanoxantha. Paler one could be Russula cremoricolor or even R. emetica but I am not sure.
I usually found one with dark red (almost purple) and the one that's paler. Is that the difference?