Hi schubertiad,
I was particularly interested in listening to the Poulenc "Novelette". Poulenc infused his music with a great deal of wit, irony, bittersweet lyricism, and French charm. I think you brought out the spirit of this piece quite well.
Almost all of Poulenc's compositions began as improvisations, which is a good thing, because they always sound like fresh creations, even with repeated hearings. Once he had a few improvisations polished, he'd invite friends to his home to perform them in a casual recital. If his efforts were enthusiatically received, he'd then write out the scores for publication. If he was especially fond of a certain passage, it would crop up in thinly disguised fashion in another or even more work(s); so yes, he did recycle some of these moments as you suggest. In a way, I like that, because it reinforced his unique idiom, almost as if he placed his signature within the music. Other composers would do that on occasion too. One of the Rachmaninoff "Etudes Tableux" appears within his 4th Piano Concerto, for example.