Sort of. A lot of the churches that were separated during the Great east-west Schism of the 11th Century eventually decided that they approved of the authority of the Pope and came back to the Catholic faith. They were termed UNIATES, a term which is now considered derogatory. There are many different Eastern Catholic churches that are in full communion with the Holy See. They differ only in the Authority of the pope and in the way the Holy Spirit is perceived. Catholic churches believe that the Holy Spirit comes from both God, The Father, and Jesus, with the Orthodox believing the Holy Spirit comes directly from God, the Father only. Other than that, the two are almost exactly the same theocratheoretically speaking

All “Anti-Orthodox reformations” were somewhat the opposite of the Protestant reformation. They were conservatives that believed the Orthodox Church was liberalizing heretically.

The Old Believers rejected some reforms in the 17th century Russian Church that made it much more like the Greek Church, which was essentially much less hardcore.

The Old Calendarists rejected the switch from the Julian Calendar to the Gregorian Calendar for static holidays in the 20 century.

Some Old Believers and some Old Calendarists broke communion with the other Orthodox Churches, which is also the opposite of the Protestant reformation, where the Catholic Church excommunicated the Lutherans.