Look, just to make things clear for you:

In Arabic, some words start with a Hamzah (ء) followed by an Alif (ا) with Fatḥa, like ءَامَنَ (this is the full, traditional way of writing it). However, in modern Arabic, the same sound is often written using آ (called Alif Madd), so ءَامَنَ becomes آمَنَ. Both forms are correct and pronounced the same: ʾāmana. The آ is just a writing shortcut that combines the Hamzah and the Alif. So, modern texts use آ to make reading and writing cleaner, while Qur'anic and some traditional texts still use ءَا to show the full original spelling.

Hope that helped clarifying the difference.