Rear bumper K12 Difference

Question to the spare parts professionals among you. Daughter has managed to kill the rear bumper when turning backwards. The plastic has broken and left a visible damage – in short: the part has to be replaced (with any grinding / spatula optics repairs I don’t even start at first) Now asked at Nissan – the part costs almost 260.-€ ! In the net, however, there are already about 60.-€ which, average so about 80 – 90 Euro. Supposedly, all of them should fit. But: the original Nissan bumper has the ETN 85022BC440 however, all offered in the net have either the ETN 640 or 240 at the end. What exactly the difference existed also the Nissan man could not tell me. If it were only a difference with no restriction on the pass accuracy then would be yes o.k. The “original” 440 end number anyway seems to be given to no single accessory dealer, already the whole www. My question therefore – someone can definitely tell me the difference of the numbers of the 440 or has listed one provider?