Yes, but both does have the red sticker isn't is ?

There are 3 L8 ECUs :

WD48.08/L3E-31 (red sticker)
WD48.08/L3H-34 (red sticker)
WD48.08/L3H-93 (green sticker for catalysed car)

So you mean that one of the 2 red sitckered ECU has a catalyst software inside it, but isn't used ?

Thank you for the explaination, Stu.