Out of the several modern Indo-Aryan languages that evolved in the eastern part of India, Assamese and Bengali are the two most prominent ones. Though both these two languages reached their respective present existence after passing through different phases of development, yet their roots are the same. Therefore, between both languages, there are many similarities even though both have evolved in distinctly different geographical areas, and there exist distinct differences between them. The differences not only create the distinction between them but also express their individuality too. In both, languages, pronoun and pronominal have occupied an important role in the discussion of morphology. Along with pronoun, the use of various pronominal which have evolved from the same root has flourished in both the languages. In this regard, both similarities and differences could be noticed in these two languages. Therefore, to identify the co-relation as well as the linguistic characteristics of both the languages, the comparative analysis is the only way out. In this study, an attempt is made to focus on how the pronominal of both languages are used to identify the similarities and differences between the two languages.