Both Latin and Byzantine Catholics have exactly the same faith. The differences are mainly in church architecture, daily Christian customs, and the way of celebrating the faith and the sacraments. For example, Baptism, Eucharist, and Confirmation are all received on the same day of initiation in the faith. Another difference is that Eastern Rite priests can be married.
Many of the forms and customs in the Byzantine Rite correspond with the Eastern Orthodox tradition. However, contrary to the Orthodox, Greek Catholics are fully part of the Catholic Church. The liturgical year may be different where Eastern Churches continue to use the Julian calendar (25 BC), whilst the Western Church has embraced the more common Gregorian calendar (1582 AD).
