I don't think the OO churches have some common "OO Biblical translation." The Armenians have their texts, and it seems that they follow the Peshitta just as the Syrian Church does. Then you have the Ethiopian texts, which in some ways may follow Coptic texts, which in turn may follow Septuagint.
There's nothing really straightforward about this. I'm not much of a Bible expert, and I'm sure other people do not know the answer to your question.