«وَالنَّسْخُ: رَفْعُ تَعَلُّقِ حُكْمٍ شَرْعِيٍّ بِدَلِيلٍ شَرْعِيٍّ مُتَأَخِّرٍ عَنْهُ»
Abrogation is the removal of the applicability of a legal ruling through a later legal proof.
The definition involves four elements: an established legal ruling, its prior applicability, a subsequent legal proof, and the cessation of that earlier ruling's applicability in the relevant respect.
Two different narratives, rules applying to different circumstances, or a mere clarification of an earlier statement do not necessarily amount to naskh. Calling the later proof a nasikh is figurative in the ultimate sense: authority over legislation belongs to God.