The re-use of a musical “theme”, motif or subject isn’t really anything unusual, and never has been. Composers have been recycling and re-using themes — their own or others — for as long as there is music history. So I don’t mind it either when it fits. Even Beethoven got a lot of mileage out of a theme he used and recycled in different compositions, such as in “The Creatures of Prometheus”, his third symphony, or his violin concerto, plus some piano work. So if Beethoven could do it, why not Sarde. 🙂