Liszt Transcendental Etude No. 10 (Allegro Molto Agitato in f minor) sounds like Chopin Etude Op. 10 No. 9 (also in f minor!). They both have the same beginning motives. Not exactly, of course: The Liszt skips slightly more and outlines rather than move smoothly, but the two are strikingly similar. There is also a repeated-note motive that appears later in the Liszt that serves as the B section of the Chopin. Hmm...