When you double click on wlan1 or wlanx you see PCI info in tab general. I think, its the location of minipci card. Its for example 00:12.0 or 00:13.0 or 00:14.0 in my 433ah. Maybe when you put pci card in any slot, ir just marks it wlan1 and when you put other it marks it wlan2. So its not strictly dependent on slot.