Are the ars nova of 14th century differed from older music in that new notation system permitted composer to specify almost any rythmatic patterns?

Yes, the ars nova of the 14th century differed from older music in that the new notation system permitted composers to specify almost any rhythmic pattern.

Prior to the ars nova, music was notated using modal rhythm, which had a limited number of rhythmic patterns that could be used. Ars nova introduced new note values and symbols that made it possible to write down complex and intricate rhythmic patterns that were previously impossible. This freedom allowed composers to create new and expressive forms of music that had never been heard before.