I'm not convinced you are correct about this. Jazzdisco does indeed say that PR 7801 was released in 1960, but it also identifies PR 7801 as a reissue of Prestige International, PR-INT 13031. See, http://www.jazzdisco.org/prestige-records/catalog-7800-series/. The Both Sides Now preview Prestige reference says PR 7801 was issued in 1970 and is a reissue of Prestige Folklore 14007. Both Sides Now already has a completed Prestige Folklore discography and it shows Folklore FL 14007 to have been released in 1963, and also identifying it as a reissue of Prestige International PR-INT 13031. See, http://www.bsnpubs.com/fantasy/folklore/folklore.html.
So I continue to believe that the Prestige International version was released first.