I'd say that the difference is mostly the intended use but you're right a map could be used for a battle or for role-play depending on the circumstance. You may-want to use the map just to fight, or want to use the map to set some "game elements", the tavern has some private lounge on the side, room where you can "buy some love" on the upper floor, and in the basement there is a few cages where the local mafia keep persons who needs to have a talk with the boss (and may loose some finger in Yakuza inspired scene)