You didn't notice? Interesting! Perhaps you should try playing the first two measures of each piece, one right after the other. If you do, you can't help but notice the striking similarity. Maybe take another look at the score to make sure you've got the right notes. And make sure you're playing CHOPIN'S OPUS FOURTY-FOUR and BEETHOVEN'S OPUS TEN, NUMBER ONE, MOVEMENT THREE. Keep your ears open, and don't worry, you'll hear it just like everyone else does.