A:
Most of the differences are with the media and shortcut keys included. This particular one has a FN key and a number of shortcuts assigned to them on the F1-11 keys. The keyboard designs, radio strength, battery usage, and a few other features are the usual differences.
There are plenty of websites that offer feature comparisons. Most online sellers including Best Buy have this feature included in the shopping experience. here are a couple to explore:
http://www.bestbuy.com/site/searchpage.jsp?st=Keyboards&_dyncharset=UTF-8&id=pcat17071&type=page&sc=Global&cp=1&nrp=15&sp=&qp=&list=n&iht=y&usc=All+Categories&ks=960&keys=keys
http://www.logitech.com/en-us/keyboards/keyboards