There is actually a lot of differences between the two. The Panspeed looks more geared to a H-mount type setup, the vent is further forward on the hood and the lower edges of the vent are almost perfectly parallel to the ground when the hood is closed. The vent is also slightly more wide and much longer with more lip on the vent. The GK has a more narrow and angled opening. On another note, the FCs I've seen running a GK hood all had front mounts.
