Just copy your server folder and make another one, and change the ports in char/ and world server conf's in your new folder and change them in config.ini aswell, then check whats the highest server id in your other folder's conf's like Login =1, char = 2 world = 3, so in the new folder char = 4, world =5 and just load char and map in the new folder, just with changed char and map ports.
Like this for example:
Say your first server is in D:\Fullserver_v12_11\
Copy that folder, and paste so you'd have
D:\Copy of Fullserver_v12_1\
And in D:\Fullserver_v12_11\ you have loginserver.conf,char and world
login = 0
char = 1
world = 2
So in D:\Copy of Fullserver_v12_1\ make sure
Char = 3 and world = 4 in the configs even in config.ini
And it should work alright.. If I need to be more verbose, Let me know.