Yes, there's 2 different headsculpts where each one has the squares/indentations sculpted on opposite sides. Also the black rectangles around the base of the neck are painted either as small rectangles or large rectangles. The differing headsculpts are the most significant variation though. View examples here:
http://www.landoslocker.com/range_esb/images/fx7/fx7_comparison_shott.jpg
http://www.flickr.com/photos/61145178@N08/5729391580/in/set-72157626615235953