I don't think so. RC1 and RC2 were upgradable (with XP-Pro), but I dont' think the minor builds are upgradable. Even then, it wasn't a documented feature (that I saw, anyway) - I found out by trying. I suggest you do the same - just try it. If yours was an official MS d/l then it must have been part of the official Beta scheme. Why not just ask MS? Or use the Beta newsgroup, if it's still active.
If I was going to guess which versions you would be able to upgrade with (and this is only a guess) - I'd say that it would be Pro, and that the full version would be more likely to work. It's only a guess. The only path I can personally testify to is that RC1 and RC2 can be upgraded to final/gold/2600 with the full (not upgrade) XP Pro license/disc.