The Qur’an with vowel points has not changed until our day
Allah stated in the verses that the Qur’an is unchangeable:
...THERE IS NO CHANGING THE WORDS OF Allah... (Surat al-An’am, 34)
The Words of your Lord are perfect in truthfulness and justice. NO ONE CAN CHANGE HIS WORDS. He is the All-Hearing, the All-Knowing. (Surat al-An’am, 115)
IT IS WE WHO HAVE SENT DOWN THE REMINDER AND WE WHO WILL PRESERVE IT. (Surat al-Hijr, 9)
It is truly a noble Qur’an in a WELL PROTECTED Book. (Surat al-Waqi‘a, 77-78)
FALSEHOOD CAN NOT REACH IT FROM BEFORE IT OR BEHIND IT – it is a revelation from One Who is All-Wise, Praiseworthy. (Surah Fussilat, 42)
As our Lord reveals in the verses above the Qur’an will remain unchanged. The Qur’an has not survived to our day merely in written form. In the time of our Prophet (saas) there were hafidhs learning the Qur’an by heart. Consequently the Qur’an with vowel points in our day was prepared in a way convenient to the memorization of the Hafidhs of the time. The Qur’an memorized by the Hafidhs of the time of our our Prophet (saas) is exactly the same as the Qur’an in our day insha’Allah.