I've updated this addon. Now, when a texture is shared by multiple materials, it lists each of them as values of a set of custom properties. You can then paste the correct value to your Blender material name, and set the NoChange custom property to keep the chosen material.
It does this for collision textures too. You'll end up with 36 custom properties to choose from.
Same link as before, but reposting anyway:
Reinstalling it is very easy. Just download the above, in Blender go to User Preferences > Addons >Install from file. Select the zip file and it'll overwrite the previous version.
Edited by R Soul, 14 October 2018 - 06:50 PM.