Kolo will tell you that Marionite Catholics and Orthodox communities sin the Middle East do this
routinely and spontaneously. The problem is that communion means
communion of faith and we have not reached that point yet. As long as we profess a different faith, even if it is different by one word, it is not the same faith, and we know that the differences are more than one word.
The laity, however, want to feel "at home" in either Church and use Communion as an expression of a wishful union. It's good that there is a convergent feeling among our communities, but the Eucharist should not be used as a means toward reunion but rather as an expression of one.
I'm curious to see what the Metropolitan has to say.