The Accra Declaration focuses on collective harms, especially economic, that we caused by the Slave Trade. While it calls for reparations, they are mostly to repair the African countries economies to where they would be without colonialism. In addition, they ask for a United Nations Decade for People of African Descent, aid in economic restoration, and recognition of the issues from colonial Nations. The harm named in the Declaration is mainly harm to countries.
In contrast, the demands from the Diaspora are personal. They want the same recognition of harm the Accra Declaration calls for, but what is being recognized is ongoing harm to persons and culture, and ongoing policies that are designed to benefit the white European male and his descendants.