You wrote "w45.60/l20-67 " as your ECU part number. A web site I've found says that the L6 is w45.06/l20-67. Either yours or the website may be a typo, so I'd take it that your ECU is indeed a L6.

Try your ECU on your mates car. Even if your chip doesn't match their spec, if their car fires up on your ECU, it's your loom at fault.