I have been asked this question several times. My answer was (more or less) that there is no real difference concerning the theoretical background - it is more about the geographical place, where the different ways of thinking were developed. The decolonial branch is Latin-american, closely tied to the "Grupo Modernidad/Decolonialidad" (even if it does not exist, as its members claim) around people such as Mignolo or Quijano. The postcolonial branch is older and has been developed in India and/or by Indians, tied to groups such as the "Subaltern Studies Group". What do you say? Is post-colonial and decolonial thinking basically the same? Is the decolonial branch a copy, an adaptation of the Indian theories?