In one sense it is exactly the same job, and in another it is completely different.
Father Seton is one of four Anglican priests who will be ordained into the Catholic Church in Melbourne on September 8.
Father Seton holds his last service at All Saints Kooyong on September 2.
Then he and - so far as he is aware - his entire congregation will regather a week later at the Holy Cross Catholic Church in Caulfield South.
There he will minister to the same people (and, doubtless, some new ones), using the same liturgy and singing the same hymns.
But now they will be on the opposite side of a once-bitter sectarian divide.
''In a sense, we are just moving office,'' Father Seton said yesterday.
But he, along with Fathers James Grant, Ramsay Williams and Neil Fryer, will now be priests in the Ordinariate of Our Lady of the Southern Cross, the Catholic Church's new Anglican wing set up by Pope Benedict for those who felt disenfranchised by the ordination of women and other developments in the Anglican Church.
Clergy in the ordinariate may be married, as is the Ordinary (the head), Harry Entwistle, who was a bishop in the breakaway Traditional Anglican Communion, but a married priest cannot be a bishop.
Father Seton believes it is ''a safe place'' for Anglicans with Catholic inclinations.
''So many of us have tried to find a space within established Anglicanism, but there's really no space for us any more. If you don't embrace the new religion they don't want you. You've got to believe in same-sex marriage and women priests, things that we just can't embrace.''
He says traditional Anglo-Catholics have been portrayed unfairly as misogynists, and treated by some liberals as ''a bit of a joke''.
''But we are taking our patrimony with us - the Anglican way of doing things and the spirituality and the theology. We will be pretty much what we always were.''