The Orthodox Church, every one I've heard of, requires that Catholics denounce the false doctrines of the Bishop of Rome to convert to Orthodoxy, and I have personally witnessed it myself.
It is not a matter of being more similar than different. The Monophysites are extremely similar to the Orthodox in practice, and that doesn't change the fact they hold an absolutely heretical beleif. There can be no capitualtion of truth for the sake of unity.
Show me one Orthodox church that does not renounce the false Doctrine of the Bishop of Rome.
Show me one Coptic Church that does not renounce the false doctrine of Orthodoxy, or Catholicism BEFORE the Great Schism. Show me one Nestorian Church that does not do the same thing.
Your statement proves nothing.