eastern rite Catholics who are married can become priests.
Roman Catholics who are married can only become deacons.
Roman Catholics will accept eastern rite priest who are converting. Hence married Roman Catholic priests.
1n 1990`s a Catholic parish east of San Francisco had a married Episcopalian priest as its pastor- so it is nothing new
You're confused. An Eastern Rite Priest is a Catholic Priest. In order to change Rites within the Church one must receive permission from the Holy See. Priests, by and large, don't change Rites once they are ordained. An Eastern Rite Priest, or Latin Rite Priest, for that matter, may be bi-ritual meaning that he can celebrate Mass in accordance with two different Rites. Father Mitch Pacwa S.J. is one example.