It's different in that you need to extend each of the wires that goes to the USB header and be sure that they are oriented properly.
Similar to the Ethernet then I guess but probably a bit harder. After the cut to put the end on it I had to put the cables back in the correct order.
Edit:Just thought of it now but I could always use the long ones from the front headers that I never hook up, I probably have a 550D that is unsellable to due cutting it like a hack to fit the RIVE in it.
Double Edit: Apparently no need as replacements are sold http://www.corsair.com/en/parts/case-parts/300r-front-i-o-panel-with-all-cables-and-connectors.html
Triple EditNow to find one with USB 3.0 and USB 2.0 as I have seen posts on various forums of USB 3.0 being weird with certain peripherals. Unfortunately the 800D one is not listed in corsairs parts section. Edit: found it somewhere else FUARK EDITS!@!@!