As you so well pointed out, though missed yourself, those are two pieces of concept art for Connacht. It seems that most of Myth III will portray Connacht in the second image you posted, of Connacht the Gower-boy-huntsman. We see a very Berserk-looking guy now for Connacht, here:
http://www.mythwolfage.com/media/screen/
This shows some images of Connacht with his axe. Eventually, he becomes Emperor of the Cath Bruig. When this happens, he changes his appearance, going bald, shaving his beard. We never see pre-Imperial Connacht before Myth III, only in his Imperial Robe and/or with a spear. The first one you post is far more like this, so this may still be a Connacht in Myth III.
Again, this is all concept art.
»–)›
PS: If it says its concept art for Connacht, then it's not concept art for Moagim Reborn.
