What is the main difference between Eastern Orthodox Church and the RC Church other than priest can marry and they have a different leader?
I am going to ping NYer on this because she would give you a much more accurate and thorough answer than I could. I am a Latin Rite Catholic, which is the biggest rite in the Church.
Basically when the great schism took place between the eastern and western Church, the eastern churches (Eastern Orthodox, Russian Orthodox etc.) broke from western Church. The Orthodox do not recognize the primacy of the Western Patriarch (Bishop of Rome/Pope by other names) But for each of the Orthodox Churches there were believers who either did not break or later came back to communion with the Bishop of Rome (the Pope) so many of the rites of the Catholic Church resemble in practice the Orthodox churches. One example is the Eastern Orthodox and the Eastern Rite Catholics. So basically for every Orthodox Church there is an equivalent Catholic rite.
NYer will correct and add to what I posted I am sure.
Oh I didn’t really answer your question. Their liturgy is somewhat different. They celebrate The Divine Liturgy instead of The Mass, although they do essentially the same thing. Orthodox priests do marry as do most rites within the Catholic Church. I believe (although I might be wrong) it is only Latin Rite Catholic priests who practice the discipline of celibacy and don’t marry, although there are even many married Latin Rite priests who have converted from Lutheran and Anglican Churches.