The nearly complementary distribution of the two verbs nsy < nśˀ and nsb (as well as the absence of any obvious cognates for the latter) makes it almost certain that the latter is derived from the former with the addition of the preposition b_, as long recognized. All the more interesting, then, is the first-cited single example from OfA Ahiqar that uses the two as synonyms!
NB: Many of the idiomatic usages with object nouns are reflections of Greek originals.
Note that the taking has a human object only where the sense deals with the establishment of a change of personal status.