I respect your investigations, but these two accounts are posting in different local sections. Although India and Bangladesh are neighboring countries, as Wikipedia shows, both languages can understand each other.
Although cafter also writes in English in the Indian section.
Bengali is the main language of Bangladesh. In India, there are many region. West Bengal is one of them. People from West Bengal also talk Bengali though the tone of verbal communication is a bit different.Although cafter also writes in English in the Indian section.