Degannwy and Dvergeheim are my creations, based loosely on the entries for Moloch and Lorelei in the 2003 edition of the Undead Sea Scrolls, a fan-made netbook from the Fraternity of Shadows. They're not canon at all, but I made sure nothing in them contradicted canon -- in other words, they're an addition, not a replacement.
The maps of the Village of Barovia region are not different from what we have, you just have to keep in mind that 2 of the 3 maps you posted are flipped on their side, with north pointing to the right. If you flip them so that north is pointing up, you'll see that they match up just fine.
Our version of the Village itself are a little off, but I plan on adding another area to correct that. Bear in mind that the NWN engine doesn't allow for the diagonal streets that are drawn on those maps.