Idiot, if Dalit and Brahmin live near each other then does that make them similar? Look how many Binari actors are in Bollywood like Sushant Singh Rajput and Manoj Tiwari and yet there are no Bengalis in Bollywood so how can we been same?Bihari idiot grow some grey matter people are same at those low distances. Dialects can be different. Even NW Bangladeshi dialect is different from the standard Bengali we speak.
Here are High caste Biharis, not a single Bengali looks like them: