Apply the base texture with its usualy mat pose or material preset, so that everything else is going to be textured to match.

Go to View>Tabs>Surfaces to open the Surfaces palette.

In the Surfaces palette select Victoria's 1_SkinFace from the list of surfaces in the palette (I think it's at the top by default).

Click the button under the colour Bar for Diffuse, where the original texture map is listed, and choose browse... from the menu that pops up.

Find your modified texture in the file dialogue, select it and load it.

Save as a Materials preset for future use.