Some have directional differences (Arabic, Hebrew, Persian, Dari etc.), some use a different notation system to indicate vowels (Arabic, Hebrew, Persian, Dari etc.), some combine different writing systems (Japanese) and some use diacritics (Vietnamese, Khymer).
Chinese uses detailed characters in a logographic script.
*There is no ready teaching resource that can easily be utilised for students from different scriptal backgrounds.
English language "phonics" materials assume a large English vocabulary - and are designed for very young learners. Even English-speaking youngsters take three or four years to develop their reading skills.
Older English learners, and those already literate in another script, may want to move quickly in their English learning - sometimes too quickly to fully grasp the complete set of 44 sounds in English and the myriad ways in which thay can be written.