Not including language or other minor cultural/ethnic differences.
Feel free to answer my question for any of the Holy Week services, but I'm especially interested in the Paschal Divine Liturgy - traditionally held Saturday night.
I feel like my title is confusing, so here's more context:
Pascha will be celebrated the same way across most Orthodox countries and has supposedly been celebrated the same way for hundreds and hundreds of years. I would like to know how long it has been this consistent.
The date for Easter is related to the date of Pesach, which is charted by the lunar calendar. Right there you have one big point of contention if you want to set a fixed date by one of the Roman/Christian calendars.