We will never get the same look as those games.... It´s because of lighting and shadows! But texture work is like magic for everything '>
And the tno buildings or the one from zwerkules are pretty similar to what you showed there. You always have to make a compromise with nwn. It´s old, very old but nevertheless the best modable game outthere RPG wise '>
I suggest you only take these games as an inspiration for future work and not more.
The buildings there are very blocky too and only the lighting and textures do the magic imo. I have used more polys for buidlings as the ones from these images but the result is less fancy anyway. Also these buldings are placeables and the terrain.. forget that.