If you are asking can you use different cities of older full CXs (i.e. other than these 12 cities) together with the ones from Post #1 without conflict, the answer is yes because although the versions are different the mapping areas are not overlapping. Just don't have old and new versions of the same city. What you also need to keep in mind is that you should not select a different version CN to the CXs you have selected or there could be conflicts because the maps are then overlapping. It doesn't matter naturally if the CN & CX versions do match.