All files in folder 'map' (*.fda, *.fjw/fjv, *.fpa, *.fsp, *.ftr and *.hnr) are linked to (depending on) active *.fbl files.
So, for every country they must be same provider and same release. You can mix different providers for different countries, but than you can not use *.hnr files.
Files in other folders (building, dem, poi, speedcam) can be different releases and from different providers.
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