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Sorry if I confused you but the answer is still the same.
Every map has to have the relevant SCDB files added to work correctly (the SCDB world file can be used on any map as it obviously covers all the maps but is a correspondingly larger file).
The "mobile speed camera file" also has to be added to each map that it covers. So for your maps both Europe and Eastern Europe both require the file adding.
I do not use the SCDB mobile file but if as you say it only covers Europe then there is no point in adding it to your USA & Canada map.
Cheers