There was an MP3 of "When The Stars Go Blue" posted on MP3.com back when "Live in Dublin" was first released. That version was identical to the live version except that the intro and outro were faded. I think I have the MP3 somewhere, but I can't seem to find it. At any rate, I assume that this MP3 is the same version from the promo.
Also, the promo track is listed as being 4:20 in length, which is the same length as the "Live in Dublin" version.
Finally, there are production credits for the "Dreams" version that include remixing and additional production that do not appear on the promo production credits.
So, no, I don't believe the version from "Dreams" is the same version that's on the promo.