From the DTS website:
DTS-HD Master Audio is capable of delivering audio that is a bit-for-bit identical to the studio master. With DTS-HD Master Audio you will experience movies and music exactly as the artist intended.
Bit-for-bit Identical
DTS-HD Master Audio delivers surround audio that is indistinguishable from the original soundtrack or music recording. The new high definition optical discs have far more capacity than standard DVDs. This allowed DTS to develop a surround sound format to deliver surround sound at super high bit rates - up to 24.5 Mbps on Blu-ray discs and 18.0 Mbps on HD-DVDs that are vastly superior to standard DVDs. This bit stream is so "fast" or the transfer rate is so "high" that it can deliver Lossless Audio, a "bit-for-bit" recreation of the original recording. The result is 7.1 channels of audio that are identical to the original studio master. With DTS-HD Master Audio you will experience movies and music exactly as the artist intended.
But they also show these two scenarios:
http://www.dts.com/dts-hd/dtshd-mast...g-receiver.php
http://www.dts.com/dts-hd/dtshd-mast...w-receiver.php
Now, theoretically, they should be identical. But you have to convince me that the decoder in one machine is as good as the decoder in another, and that the mixing/postprocessing/DAC is equally good, as well. It may be BIT for BIT, but that does not mean there are not some errors in those bits.