The easiest/safest/best way is to remove a keycap, based on the layout i would suggest you just gentle pull on the ESC key and you should have the white keycap in your hand and then you can look at the switch, if it has a brown/red/blue "pin* where the keycap was sitting on (as far as i can tell its not sold with other variants) after this you just press the ESC key back onto the switch. Another option is that it should be printed on the box but it might be that the display board is in fact using different switches then what is below in the boxes as mostly the MediaMarkt employee who installed the display has no idea that they are different versions and might have mixed it. So easiest and safest, pull the ESC keycap off and look at the color. If any other colored pin feel free to let us know and we might be able to assist. Cheers