Carying over information

So I am currently working on a project, and now applying the materials and textures. Half way into applying the materials I notice that I need to make a slight change to the 3d mesh. So when I make the changes do I have to apply the materials all over again, or is there a way to use that previous mesh as a reference?

If you are using the same material for the mesh, re-importing it will keep the material on that mesh.