So do it first, (and better), to do it like this:

create two folders instead of the "addons" one, MappeTT and MappeHere containing the folders that are in addons, (content/building, map, poi, etc.), and containing the files of the related maps.

in the sys you create a path for the two maps:

android_secondary_root_path="/storage/40FB-A3B3/MappeTT"
;android_secondary_root_path="/storage/40FB-A3B3/MappeHere"

by deleting and adding only the semicolon with the File Manager you can use the maps you like.