If the orthodox church is outside the body of Christ, even though it is identical in belief and practice to the catholic church minus the pope, then the catholic church is outside the body of Christ. The catholic church in reality is the church of itself, as it clearly worships itself.
The ‘Orthodox’ sects (and there are many different ones) are outside the Body of Christ. They are not identical in belief and practice to the Catholic Church, even if you prescind from the truth of the Papacy. They reject the Filioque and the true doctrine of God's simplicity, among other things. See this: https://endtimes.video/the-trinity-the-filioque-catholicism-refutes-eastern-orthodoxy/ The Papacy is a truth revealed by God. To reject it is to reject Christ's revelation. You will find videos that thoroughly refute Eastern 'Orthodox' theology here: https://vaticancatholic.com/eastern-orthodoxy/
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