Bryce only export the diffuse, ambient and specular solid color textures ,UV mapping and Normals. Bryce doesn't export (except with terrains) any DTE procedural or image textures. So if you're trying to export procedurals you're pretty much out of luck. If they're using image textures, you can use almost any modeler (even Poser and D|S) to apply the original image textures and re-export.