There's NaurwenT...
The way I would normally think of it is for different civilizations to be grouped into hirearchical levels of similarity. Dol Amroth is clearly part of the Realms in Exile, as it is a province of Gondor. As a result I would think that they would have all of the same units, buildings, etc. They might get some specific bonuses, e.g. greater benefits for allying with Elves (or better relations with them), or perhaps experiencing a slightly different rate of gather of some commodities or benefits of some goods. Nonetheless they are Realms in Exile.
Constructing Gondor in such a hirearchy, however, is really difficult because unlike most of the rest of Middle Earth, Gondor is a multiracial society, and is in fact particularly challenging because, in Gondor, the two races, both being different grades of Men, blend into each-other. But this is generally true for most civilizations; the Elves tend to have similar attributes whether Eldar, Sindar, Avari, or whichever of the four ages of Middle Earth, and the same goes for Dwarves, the forces of Darkness (Melkor's major creations excepted), High Men, and lesser Men, respectively. I expect there to be numerous underlying similarities between the Galadhrim (i.e. Third Age Sindar-Avari) and the House of Fingolfin (i.e. First Age Noldor), for example, although I would still expect even more between the Houses of Fingolfin and of Fingon, for example. Yet Gondor should look like some kind of hybrid between Númenor and presumably the Northmen or the Rohirrim (or even the Haradrim).
I'm afraid I know nothing about Narnia that is worth discussing. I plan to see the movie in a few weeks when it comes out. I fully expect that the director will do no better than Peter Jackson at the impossible task of adapting a very detailed book for the silver screen, so I presume that I will not be an expert on Narnia when I walk out of the theatre..
This post has been edited by Beren IV: 27 November 2005 - 04:38 AM