Is Sarawak Arab democratic republic a part of western Sahara?

Sarawak is not in Africa. It is a Malaysian state on the island of Borneo, which is north of Australia.

The name "Western Sahara" is a term that refers to the region. The Polisario (the militant group that is trying to free the Western Sahara from Moroccan control), controls roughly 9% of Western Sahara's territory de facto. In international agencies, it identifies the "nation" it represents as the Sahraoui Arab Democratic Republic. Since some people spell Sahraoui as Sahrawi, it easily could be confused with Sarawak. (Sahraoui/Sahrawi means "Saharan" in Arabic).