Huawei Mate 9 Porsche Design was launched along with Huawei Mate 9 in the same event. As the name suggests, Huawei Mate 9 Porsche Design is the premium version of the regular Huawei Mate 9. So it comes with better hardware specs and few changes, here and there.
The major difference is in screen and the design only. Huawei Mate 9 Porsche Design comes with 5.5-inch Quad HD AMOLED with 2560 x 1440