Augustine. Exposition on the Book of Psalms. Schaff, Philip (editor). New York: Christian Literature Publishing Co, 1886. Nicene and Post-Nicene Church Fathers: Series 1: Volume VIII. Re-published 2014, Catholic Way Publishing. Kindle electronic edition, ISBN-13: 978-1-78379-372-3.
Augustine's notes on Psalm 108 are very brief. He considers the material to be closely related to that of Psalm 56, Psalm 59, and some brief portions of Psalm 135 and 115 (Augustine Psalms, loc. 338055, par. 1) Ths differences are easily understood. Augustine does recount most of the slight differences.