Ideally, that is the only difference. In practice, we’ve developed apart from each other for nearly a millennium, so there are differences. We’re actively working to narrow the gap, but individual parishes are at different stages of renewal. A lot of our renewal of tradition has come since Vatican II which directed Eastern Catholics to look to the Orthodox for our patrimony and to close that gap.
The Ukrainian Greek-Catholic Church reaffirmed communion with Rome in 1596 with the Union of Brest. Mostly it says that Rome assures us we’re going to be able to continue thinking and living as Eastern Christians within the Catholic communion. There are two points where we say that we accept that Roman/Latin teachings and practices aren’t heretical: the filioque and purgatory.
The filioque is “and of the Son” that’s in the Creed. It didn’t use to be there and the union says we will continue saying it the original way while we accept that Rome will continue saying it with the filioque addition. The Orthodox have not made a statement that they accept (or reject) either teaching as being a Roman way of expressing the same truth, leading some Orthodox today to say Rome is in heresy on these issues.
You can read the treaty of union at EWTN:
ewtn.com/library/COUNCILS/TREATBR.HTM
It is a big, sad, long and convoluted story that involves misunderstandings, poor communication, pride, secular powers, and I don’t even know what else. Both sides worked to maintain unity and even came to an agreement that restored unity, but then it just didn’t take off and we’ve stayed apart for all this time.
ewtn.com/library/councils/florence.htm
I’ll ask for a recommendation for a video or book that covers it at an introductory level.
I don’t discuss my personal life online. Too many crazy people out there! Sorry about that.