Information available/known, or interpretation of information? (Search me, I'm sure a lot of very smart academics've slugged this one out.)
I don't think it's a spoiler to say that Bohdan and Yana have at least somewhat similar backgrounds, given that the "about Ukraine" tab up there says they're from the same region of the country. As a side note, they have the same base accent -- Yana's just slangier for personality reasons. You can make a lot of useful-if-imperfect assumptions about someone's enviorment based on regional/cultural accents...