you may want to track down the R6 DTS DVD of JP as well if your comparing
That was an exclusive DTS track to that region that was 1536kpbs and apparently a different mix. I had it for a while and it sounded superb. very high bitrate as well whilst reading up on it
http://www.buyoyo.com/buyoyo/eng/ProductDisplay.do?prrfnbr=71560&prtype=all
costs $5 plus shipping