Pastor, did WELS adopt the Catholic Old Testament readings after Vatican II or did you formulate your own?
WELS did not adopt the three-year cycle of Scripture readings, including Old Testament readings, as Vatican II designed them. The Inter-Lutheran Commission on Worship, which did not include WELS participation, revised the assigned Scripture readings in the 1970s for use in Lutheran churches.
In 2008 WELS did produce a supplemental cycle of Scripture readings in connection with Christian Worship: Supplement. Because of this, different WELS churches might have different Scripture readings on the same Sunday of the church year.