All ships have two AIS devices. In case one goes offline, the other one kicks in automatically. The name is pretty much the same - maybe unintentionally programmed wrongly (maybe lost by translation in the alphabet). If it shows 1 minute later with the alternative name just few feet away, is also an indication that the gps was operative and accurate. How about the MMSI Number on both names? Was it the same? If yes, this is another proof. Maybe this can be found in the database of marine traffic for comparison. Innocent until proven guilty, that is what the law should always follow.