Here:
Code:
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Gmaptool displays .img product number in header, read Gmaptool changelog here:

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and more infos here:
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Same map unlocked with Gimgunlock
Code:
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It doesnt modify the .img , header infos are the same, probably the other one was unlocked with FIU or Unlocker alternative containing old GMT.exe version and log of locked one is from old Gmaptool version.

Edit : I will move soon this discussion in Topo Austria map thread coz here is off topic