Yes, the first stone is genuine jnat, but not Nakayama Maruka. Because it is not from Nakayama mine indeed.
Check the topic http://straightrazorpalace.com/hones...ps-2013-a.html for details on Nakayama.
The second one is genuine Suita jnat, but I am in doubt that it is Okudo.
So it's better to call first one as pseudo-Maruka or fake-Maruka.
And the second one just as Suita jnat.