A person economic condition determined his status in the society, which exist till this day. There is big difference in foreign muslim settlers and the brits and hindu Jaminder is that they inter married with locals. Thats why its very hard to distinguish a foreign flock from the native anymore.
However, social status cannot be equal for a group of victors and a group of vanquished. This happened also in Bengal. Whatever may be status of all those Turkic nomads in their native lands, they became victors in Bengal in 1198 AD. So, their social status was according to their poloitical status. They were certainly above the locals, both Hindus and converted Muslims, in the beginning.
But, this status could have interchanged places among both groups of Muslims as the days went by. Muslims pray in the same mosque, eat in the same plate and fight wars alongside each others. Gradually, Muslims of different background established an united society.
As both the foreign and local Muslims intermingled with each other, the distinction was gradually removed, and matrimonial relationships were established after two or three generations. This is how the social distinction was removed gradually.
After the Khilji Turks when Bengal was overwhelmed by the Pathans from Delhi and north India, these new arrivals took away the social and political aristocracy from the local (Turks have already become locals in 1537 AD) Muslims.
Later on, there was again another change in the status when the Mughals conquered this land in 1605 AD after a long 30 year war. They also settled their own people here in order to balance the force of local (Turks + Local converts + Arabs + Negroes + Pathans) Muslims.
There came another change when the British took over. All the Muslims (Turks + Local converts + Arabs + Negroes + Pathans + Mughals) all lost their individual identity under the British. All became landless peasants. No Muslim family was regarded aristocrat after the political power changed hands from the Muslims to the British and hindus.
So, Bengal became more of a melting pot for the Muslims during British era. Rabindranath Thakur being a reader of history wrote, '-----Mughal Pathan Ek Dehe Hoye Gelo Liin.-----'