The Genevan Psalter's debt to Gregorian chant, revisited

Nearly three years ago I posted on The Genevan Psalter's debt to Gregorian chant, noting the similarities between the ancient chant Victimae paschali laudes and the Genevan tune for Psalm 80. Now a member of the Lovers of Metrical Psalmody Facebook group has alerted us to another apparent borrowing. Listen to the Conditor alme siderum below:

Now listen to Ernst Stolz's rendition of Psalm 141:

During my first two years at the University of Notre Dame, I would regularly attend the sunday evening ecumenical vespers at the Sacred Heart Church on campus. Near the beginning of the service, we would sing Creator of the Starry Night, an English translation of the Latin hymn, to a modified version of the proper melody. I had not noted the similarity to the Psalm 141 tune until now. Incidentally, Psalm 141 is also used at evening prayer, and I believe we sang this as well at Sacred Heart Church, but to a different tune.