By a happy coincidence, Catholics and Orthodox are celebrating Easter on the same day this year. However, Eastern Christians (both Orthodox and Eastern Catholics) observe Lent differently than Western Christians. First of all, they don’t have Ash Wednesday. In fact, their Lent began at sundown last night. Secondly, they don’t refrain from singing Alleluia during Lent liturgies.
And finally, they take the Lenten fast seriously. Very seriously.