Okay, this is probably obvious and I am not noticing it but I have a question. What is the difference between the Authentic kit- http://www.boutiquepsg.fr/en/category/sale/product-sheet/psg-authentic-home-shirt-13-14/587676 and the non-authentic- http://www.boutiquepsg.fr/en/catego...kit/product-sheet/psg-home-shirt-13-14/544424 Is it material wise? Just curious. Thanks!