Bangladesh has been the part of Pakistan itself. Both of these countries bear some similarities and differences as follows:
Commonalities:-
1. Both Bangladesh and Pakistan were under a military rule.
2. At both the places, the struggle for democracy took place in their own way.
3. Pakistan's administration began under the command of General Ayub Khan and gave up due to dissatisfaction among people giving way to Yahya's military rule and continued with the army rule though elections were held by military rulers to give a democratic shape to their own rule.
4. In the same way, Bangladesh drafted its own constitution to begin with democracy. Sheikh Mujibur Rahman formed presidential setup by abolishing all the parties except Awami Legue_ But after his assassination the new military ruler Zia-ur-Rahman formed his own party and won elections in 1979. Later on he was also assassinated and another military leader Lt. Gen. H.M. Ershad took over.
Differences:-
1. In Pakistan, military, clergy and land-owning aristocrats dominated socially to overthrow elected government whereas in Bangladesh the leaders and their party members dominated for the same.
2. Pro-military groups have become more powerful due to conflict with India in Pakistan whereas in Bangladesh, pro-military groups are powerful due to friendship and encouragement of India.