share or reassign materials

Hi I have a sketchup model, it's big so is in several parts. The different parts share some textures. When I export .fbx and import into Unity3d, Unity creates separate folders & materials for each texture used in each fbx. So I end up with differently named versions of the same material eg. Roof-Bronze, Walls-Bronze. Without manually reassigning the materials to each object (as there are loads of them) is there a quick way to rename/reassign/replace the materials? (to reduce drawcalls)