Dunedain, who is tanned and sporting an Aloha shirt from his last week in Hawaii sez:
FWIW, when I came back to the Byzantine Catholic Church from the Russian Orthodox Church Outside Russia, all I did was go to confession and acknowledge what I had done. I received the Holy Mysteries of Confession and Eucharist the same Sunday morning. It was a beautiful, memorable experience. I felt like I had really 'come home'. I was welcomed with open arms.
BTW, when I left the BC to join the ROCOR, I was 're-baptized' (not that it's possible, but they do it anyway) and had to make a profession of faith and renounce before the priest and a witness that I rejected the Pope of Rome. The ROCOR has a ritual book which has a list of things to renounce when you join (the Masons, Islam, whatever), and rituals (in a Q&A format) that you undergo. When I joined the ROCOR it was all 'spooky-ish' (to quote my wise bride), and definitely not the kind of experience I had when I decided to return to the fold of the Catholic Church.
This may explain why I tend to be a bit triumphalistic... :-)
Pax, mir, peace, shalom, whatever.