I didn't see the show either Gaveston, but based on what I heard in all of the video footage from the production, I see (well, hear) what you mean about Hilty in these audio snippets. Hilty sounds a bit more, subtle perhaps? Almost as if she toned her vocals down somewhat for the recording.
Nevertheless, this recording sounds divine. I can't wait to hear the whole thing! What a gem of a score.
I'll take the wind and soar.