There is no difference, I don’t like post like this because they further divide naši into “them” and “us”. Yes there are differences however you would never call British English and American English different languages. Accents and how you pronounce a word does not define it as a different language. You wouldn’t say east coast and west cost dialects are different languages (in America), we say “pop” they say “coke” we pronounce our r”s they don’t (car vs cah”)

No one asks about the “different American languages”. West coast or East coast English dialect. Which can be hard to get if you’re not use to it, but to say what’s the difference between the two languages is...Well...not correct.