Do messengers receive new scriptures?

We learn from 3:81 that a messenger “رَسولٌ” confirms existing scripture while a prophet “نَبِيٍّ” is given a new scripture.

3:81 GOD took a covenant from the prophets, saying, “ I will give you the scripture and wisdom. Afterwards, a messenger will come to confirm all existing scriptures. You shall believe in him and support him.” He said, “Do you agree with this, and pledge to fulfill this covenant?” They said, “We agree.” He said, “You have thus borne witness, and I bear witness along with you.”

وَإِذ أَخَذَ اللَّهُ ميثاقَ النَّبِيّينَ لَما آتَيتُكُم مِن كِتابٍ وَحِكمَةٍ ثُمَّ جاءَكُم رَسولٌ مُصَدِّقٌ لِما مَعَكُم لَتُؤمِنُنَّ بِهِ وَلَتَنصُرُنَّهُ ۚ قالَ أَأَقرَرتُم وَأَخَذتُم عَلىٰ ذٰلِكُم إِصري ۖ قالوا أَقرَرنا ۚ قالَ فَاشهَدوا وَأَنا مَعَكُم مِنَ الشّاهِدينَ

Further evidence that messengers do not produce anything new can be seen by analyzing Sura 46 verse 9.

46:9 Say, “I am not different from other messengers. I have no idea what will happen to me or to you. I only follow what is revealed to me. I am no more than a profound warner.”