Yes. Most sources break the mass down into individual parts, such as the "Canto de Entrada," "Señor Ten Piedad," and "Cordero de Dios." You can find PDFs for each of these sections individually.

Universities with strong ethnomusicology programs—such as the Universidad Nacional Autónoma de México (UNAM) or the Escuela Nacional de Música —often hold peer-reviewed, verified transcriptions in their digital libraries.