Following the First Republic and Second Republic Constitution, the differences between 1963 and 1979 constitutions are stated below in the table provided:
| First Republic Constitution | Second Republic Constitution | |
| 1. | It was a replica of the British type of parliamentary or cabinet system of government. | It was based on the American type of presidential system of government. |
| 2. | The prime minister was the head of government and the president, ceremonial head of state. | The executive president was both the head of state and government. |
| 3. | The prime minister was the leader of the party that won majority of seats in parliament. | The president might not be from the party that won the majority of seats in parliament. |
| 4. | The prime minister was not directly elected but was chosen from the elected legislators in parliament. | The president was elected through direct election by the electorate in a general election. |
| 5. | The prime minister appointed his ministers from his party members in the parliament. | The executive president appointed his ministers outside the parliament. He was not restricted to his party only for the appointment. |
| 6. | A minister was a member of the parliament as well as the executive. | A minister was not a member of parliament. He belonged only to the executive arm of government. |
| 7. | There was a fusion of power. The legislature and the executive were fused. | There was a clear separation of powers. Each organ exercised its functions distinctly. |
| 8. | There was officially a legally recognized opposition party. | There was no such recognition in the 1979 constitution. |
| 9. | There was collective responsibility of ministers. (principle of collective responsibility). | There was individual responsibility of the ministers. |
| 10. | The prime minister could be removed from office, if a vote of no confidence was passed on him. | The executive president could be removed from office through impeachment. |
| 11 | There was parliament supremacy | There was the supremacy of the constitution. |

