This might hurt a bit, but if you uv maped the original texture, the only way to transfer it is to have the exact number of UV's on both models, and they're in the same general area. My suggestion is to do two planar projections on the wing. One from the top and one from the bottom, then just paint the textures to match the new maps. The maps from your original posting look pretty basic, so you shouldnt have to much trouble with it.