Technically I'm sure you could have both a DTS ES Discrete 6.1 track and an additional DTS 24/96 track on the same DVD.
Seems unlikely they'd do this though, it would sure eat up a DVDs space allocation budget.
What I mean to say is that, as far as I'm aware, you can't have a single DTS track that is both DTS ES 6.1 discrete AND DTS 24/96.
It's either / or.
It's also fairly irrelevant given the total lack of 24/96 DTS soundtracks available in Englush ATM
D.Jay