Similarities:
Both the Kyrie and Gloria sections in both masses are polyphonic in style, meaning that multiple independent melodic lines are performed at the same time.
Both pieces are written in Latin, which was the standard language for sacred music in the Renaissance period.
Both works feature the use of imitation, where a melodic idea is presented in one voice and then echoed or imitated in another voice.
Differences:
The Kyrie in the Pange Lingua Mass by Josquin has a more complex texture, with more vocal parts and overlapping rhythms, while the Kyrie in the Pope Marcellus Mass by Palestrina has a simpler texture with fewer vocal parts and a more straightforward rhythmic structure.
The Gloria in the Pange Lingua Mass by Josquin is shorter and more focused, while the Gloria in the Pope Marcellus Mass by Palestrina is longer and more elaborate.
The harmonic language in the Gloria of the Pope Marcellus Mass is more conservative and diatonic, while the Gloria in the Pange Lingua Mass features more chromaticism and dissonance.
Overall, both pieces are excellent examples of Renaissance polyphonic music and demonstrate the mastery of these composers in writing music for the Catholic liturgy. While there are some differences in their style and approach to composition, both pieces are celebrated works of art that have stood the test of time.