Feldon An unauthorized article posted at Massively strongly suggests that there are in fact only 7 dungeons in The Shadow Odyssey which are recycled and reused for different purposes.
Illucide, an EQ2 developer, has this response:
That article is actually quite a bit off. There are twenty unique group dungeons, not seven. Perhaps they were thinking ‘themes’, but there were quite a few misprints there. I think I saw a much more accurate representation on ‘Zam’s site.
For absolute certain, the dungeons are very different. The way that they mention missions really makes them sound much more like LDoN than they actually are. The content between the 20 different dungeons much more varied than LDoN. The best example I can give is that while VoES & Maiden’s share the same theme, you would never confuse one dungeon for the other when running through them.
The Befallen, Miragul’s & Najena dungeons (eight total) will all scale from 50 to 80+, the three Mistmoore will scale from 70-80+, and the others are all set to be 80+.