Creating one campaign map is very much work, and for this reason I decided make both campaign in the same map scale. In future in mini-campaign will be also Lindon, Enedwaith, Harad and other lands. And when I will have units for all (or most) factions I will just remove Numenor from map (because when was Last Alliance War Numenor doesn't exist) and I will change start situation for Last Alliance War