What is the reason for the variation in the vocalization of some words between the Eastern and Western copies of the Noble Qur’an, such as the word "ننشرها" (nanshuruha) and "ننشزها" (nunshizuha) in verse 259 of Surat Al-Baqarah?

The variation in editions of the Mushaf (definition) (Qur'an) is due to the difference in recitations (Qira'at). In Morocco, the recitation of Nafi' is prevalent, with its two narrations, Warsh and Qalun, and most of their Musahif are according to the narration of Warsh. In contrast, in the East, the narration of Hafs from Asim is prevalent. This difference has affected some words, such as "ننشرها" (nanshuruha), which some have recited with a 'zay' (نُنشزها - nunshizuha) and others with a 'ra' (نُنشِرها - nunshiruha). Thus, the observable variation is due to the difference in recitations.