The liturgies of Basil the Great and John Chrysostom are almost completely similar to each other. The only difference between them is that:
1) The prayers during the consecration of the Gifts, read secretly by the priest, are longer at the Liturgy of Basil the Great, and therefore the melody of the hymns sung at this time is longer.
2) Instead of the song “It is worthy to eat as truly”..., it is sung:
In You rejoices, O Gracious One, every creature, the angelic council and the human race, consecrated in the church and the verbal paradise, virgin praise, from Whom God was incarnate and the child was born, our God before this age: for Thy throne was made false, and Thy womb was made more spacious than the heavens. Every creature rejoices in You, O Gracious One, glory to You.
3) Finally, in the liturgy of Basil the Great, to the exclamations of the priest: “Take, eat, this is My body, broken for you for the remission of sins” and “Drink of it, all of you, this is My blood of the new testament, which is shed for you and for many for the remission of sins” are added at the beginning of the words:
He gave His holy disciple and Apostle,
The Liturgy of Basil the Great is celebrated ten times a year: on Vespers or on the very holidays of Christmas and Epiphany; on the day of remembrance of St. Basil the Great (January 1); on Sundays of Lent, except Palm Sunday; on Thursday and Saturday of Holy Week.