If you are using a different db, just copy the required map files into yours. There are other map files than just the ones in the db that will need to find and copy over.
Thats assuming you are using another db.
If you are using the Revo db, you will need to add them to specific NPC's in the game, then add the monsters, drops etc.
Personally, I dont know how to add the maps to NPC's, but i do know how to add the monsters to maps.
Use this link-