Hmm, so I randomly watched episode 35 (April 7) and ~17, ~19, ~21, ~32 min mark... are those new BGMs? Not that they sound original for a Kajiura track but still...
Interesting, I haven't seen it yet. I just got the OST (soooo beautiful!), and because of it I had wanted to see the show. At last, Yuki does a beat of jungle-like music, lol. I really love this OST!
Sure, there are tracks similar to ones from other OST's (like Frenetic, Where I Stand). After so many compositions, it can be hard not to "repeat" stuff, but you can do variations and recycle them that way. These are for anime after all. It's like the director/producer asking, make this scene sound like Pandora Hearts track __, but different!