Rhia ... the reason for the difference is that Firefly uses displacement maps. SuperFly doesn't support the same type of micropolygon displacement at this time (it's still experimental even in Blender cycles). In order for displacement to work in SuperFly you have to subdivide the model until you get the look you want. But that will also reduce available resources. 

The alternative to subdividing to use the displacement is to create a morph at a SLIGHTLY higher resolution that makes the fur material a little more "lumpy". You can set the subdivision to 2 or 3, for example, and then use the Morph brush to morph the fur material to look a little more lumpy.