There are 3 versions on Gregobase, all different from each other and from this, though all recognizably "the same chant".If I had some manuscript sourcing, I could do a bit better maybe. A review I found of the recording said that most of the repertoire was from Limoges, but the Limoges version on Gregobase (though the most complete) would need adaptation to match the recording.
El canto de la Sibila (Gómez Muntané, María del Carmen, Madrid 1996) has numerous versions, including a Toledan vernacularization, "Juizio fuerte sera dado".
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