Starting a new standard game, a player must choose between easy, normal, veteran, and elite modes. After beating the final boss, you can start New Game Plus. Are there also 4 difficulty levels for New Game Plus? If so, do you choose the difficulty again or does it carry over from your character's last game?
Upon accepting and finishing the quest that gives you NG+, you will be booted back to the initial character loading screen (where you can switch between characters etc.).
You can then choose to
You are not prompted to change the difficulty mode at any time (a pity in my eyes), so your difficulty setting is carried over.
You can ofcourse always change the difficulty setting if you want, as explained in this post.
so NG+ doesn't change that percentage but merely scales the level and items. you could, however, change your difficulty by playing LAN or Online mode.