Pesahh always falls on the same Hebrew calendar week. The Hebrew calendar is lunar agricultural one that that's solar corrected but originally was brought into semi-stasis based on grain in the fields.
The European calendar adopted nearly worldwide is at least two iterations, Julian & Gregorian, removed from the old Roman calendar.
Making a clean break the Church devised calculations to assure Easter never can coincide with the Pesahh.
I guess that means Easter Sunday and the first day of the Passover hajj never fall on the same day?