What is the difference in pronunciation between "س" (sin) and "ص" (sad) in the verses of the Noble Qur'an, when "س" is written but pronounced "ص"?

Words like "yabsut" (يبصط) and "al-musaytirun" (المصيطرون) are written with the letter "sad" (ص) in the Uthmani script. In some recitations, they are read with a "sin" (س), in others with a "sad" (ص), and in some with both faces (readings). A small "sin" is placed above the "sad" or vice-versa to indicate the adopted recitation. In the recitation of Hafs, the "sin" in "yabsut" and the "sad" in "al-musaytirun" are the adopted readings, though both faces are authentically transmitted from him for these two words. There is no difference in meaning between the "sin" and the "sad" in them. Their origin is with "sin," but the "sin" was transformed into a "sad" due to the influence of the letter "ta" (ط) because of its strength and their shared characteristics of itbaq (closure) and isti'la' (elevation). The difference in pronunciation between them is clear, and to learn the correct pronunciation, one must refer to skilled reciters.