They really don't differ in any significant way.
The reason that the union of Bangladesh and Pakistan came apart in 1971 has nothing to do with religious practices. There were vast linguistic and cultural differences between Bengalis on the one hand and Sindhis, Punjabis, Balochis, and Pashtuns on the other hand. There was also the small fact that the Pakistani government committed genocide in Bangladesh in 1971 where between 300,000-3,000,000 Bengalis were murdered and 200,000-400,000 Bengali women were raped.
One is Islam. The people that follow this religion are called Muslims.
Islam
Islam is the dominant religion in Bangladesh
Islam (Shia)
Indivually, many of the Muslims try to practice Islam in Pakistan. Unfortunately, as a nation we don't practice Islam as it demands.
afghanistan, Pakistan, Bangladesh, Indonesia , Malaysia
Islam
Indonesia, Pakistan, Bangladesh, and Egypt
The cultural focus of Islam is centered in the city of Karachi in Pakistan. About 96 percent of the population in Pakistan is Muslim.
They are every where in the world but mostly in Indonesia, Bangladesh, Pakistan, India, and Egypt
The major religions practiced in Bangladesh are Islam and Hinduism. Islam is the largest religion, with the majority of the population identifying as Sunni Muslims. Hinduism is the second largest religion, with a significant minority population in the country.
Many countries including Iran, Iraq, Saudi Arabia, Syria, Yemen, Kuwait, Emirates, Oman, Qatar, Jordan, Pakistan, Bangladesh, Malaysia, Indonesia, Lebanon, ...