The Maker God has exactley the same logo as the God in Neverwinter Nights.
Neverwinter Nights 2 tried to go with a storyline that didnt work with the whole party member thing.
Bioware created both games and dropped Neverwinter for Dragon Age as it wanted a more console gamer friendly game.
Dont get me wrong i LOVE both games and i LOVE bioware i buy any game that company releases. But all Dragon Age is just an update for Neverwinter. Just as Baldurs Gate was.
But i do get what you saying the only major difference i see is that Neverwinter is more D&D strict.