Okay, so the shell does matter. I thought you were saying the opposite. Thank you for the clarification.
Until we "translate" our differencs we cannot sing the same. :)
Before you can "translate", you will need to spend some time being very clear of what those differences are. Both tasks will take some considerable time and effort, but I think well worth the investment of resources.
That's what the Churches are actually doing. Our differences are very clearly defined. They involve both theological and ecclesiastical issues. As of last November, the Churches are working on the subject of Petrine ministry and the extent of its authority. Although not much is heard about it over the media, a lot of work is being done on one of the most important issue: extent and nature of papal authority. Without a consensus on this, no reunion attempts can even begin. Once, hopefully, this is agreed upon (this may take decades!), the Pope can call an Ecumenical Council which will then address theological issues (which may take a lot longer).