Are the streams identical...do they start/stop at the same moments in time?
I suppose it's possible to send two independent audio signals through a relatively wide bandwidth in such a way to have simultaneous QSOs, but the streams would be independent in behavior.
i'm remembering they were the same, but i can't be 100% sure about it right now, i didn't analyze them that closely. i'll take a better/closer look next time i'm on the air and see them.
it really doesn't matter, i'm only curious...