Why do you need 2 materials? All sides on your picture look identical. Anyway if you still want 2 the easiest fix is PS. Select problematic areas, then Fill with content Aware option. Plus some Stamp tool. P.S. In 3ds Max displacement can work as modifier (not like a part of material) so multiple materials on one object is not a problem. Good luck. P.P.S. Try Vray Fur- it has no seams.