if you are not changing anything else and the textures are for the same ship not hard at all if you have PhotoShop, PaintShop Pro, or something simular.
Just select the area you want to change or whole texture, whatever, go --->Layer ---->new adjustment layer ---->hue/color/Contrast and you will then gat a color wheel that you can adjustthese things with. Color, saturation and Brightness will be all on one tab and the other tabs will allow you to do other things.
write those numbers down once you get the colors that you like or copy that layer.
Save the file as a BMP.
Apply those numbers over again by repeating the process over and over again, or (if you copied the layer) ctrl+L and copy it over the other textures.