I also noted this: if you load with lifetime or map updater a regional version, you get another JCV.

e.g.:
Europe All NTU 2013.10 D3048060A.JCV - 348 MB
Central Europe NTU 2013.10: D3173050A.JCV - 241 MB
West Europe NTU 2013.10: D3049060A.JCV - 317 MB
Central & East Europe NTU 2013.10: D3172050A.JCV - 139 MB