Ramadan and Hadj don’t start on the same days throughout the Muslim world or even in the rest of the Middle East. After six years in Saudi I just assumed that all Muslim countries were on the same holiday schedule driven by when they officially begin in Mecca. Found out later that I was wrong.
Yeah - the Shia Ayatollahs make it a point to start different than the Sunnis - and everything is based on the Moon - which is directly linked back to the old Egyptian Moon god named Allah...trying to see who’s in charge of the massive cult...like everything - they can’t agree on nothing!