It is not a big surprise that the outer metal part is the same. Why make a mold of the part, when there is someone tho had already done all of the mold design and metallurgy for you? I am assuming that Corteco has the rights to the mold and to sell the parts to anyone they want. The same goes for the manufacturer of the rubber section. For Febi, it makes no economic sense to try to re-invent the wheel. That "MO" number is the part number for the mold itself.
But good deceive work on your part.
I have been wondering if I should replace my damper soon. It is often forgotten that this is a wear item. It is an expensive part, and I would hate to replace it too soon.
Have you installed yours, and if so, did you notice any difference at all? What did your old one look like? Pics would be great.