Here are some screen captures from the
Shkolnitsa post in The Best Schoolgirls thread:
By just comparing these I'd say they might very well be the same person,
but comparing the years makes me be not that sure about it.
Shkolnitsa was made in 2001 and those picture galleries, if marked correctly,
are from 2006 and 2009.
It's possible, of course, that Shkolnitsa was maybe her job in porn.
It's not impossible that there could be an early appearance in some schoolgirl movie
and 5 years after she would've done some photoshoots.
Nadia's age is mentioned as being 23 in one of the sites listed in the original post.
If she was 23 in 2009, then it's impossible they are the same person.
But if she was 23 in 2006, then she would be just 18 when she did Shkolnitsa which would fit nicely to the schoolgirl theme
(even though her character was supposed to be the music teacher).