Was Martin Luther same sect as Martin Luther King Jr.?
Let's be accurate as possible and think first.
no
Martin Luther was a Catholic friar that began the movement of Protestantism after he aired several grievances against the church.

Martin Luther King Jr.

was a Baptist minister.

Baptists form a major branch of Protestantism.

Baptists trace their Protestantism to the English Separatist movement of the 1600s.

Martin Luther lived from 1483-1546.

.

Thus, the answer is no