Copy or Recover Texture Assets from my Old Route to a New Route

I have decided to abandon my old route. I have started to build a new route, but I don't see the same list of texture assets to choose from. The new route has a very very limited selection of texture assets from which to pick. Can I copy the old list to the new route? Using RW Tools I have selected the same asset sources for the new route as listed for the old route. I would appreciate help.