I really don't know if you can rebuilt the textures, I guess not, cause as I said the materials are too different, but you can find some free shaders here in free stuff or on sharecg that you can use with fine results, or buy (if you can or be interested)some shaders packages that you can use instead the original material. I'm sure most of the products can be found with both kinds of material, if not the alternative are DS shaders. But better to get more oppinions, there are a lot of experts on how DS works here.