Although I agree with callaway that Padouk cannot be duplicated with Ash or Alder, it is however possible to find a common shade by staining the wood. Since Ash and Alder are lighter than Padouk in color, try mixing up staining pigments : http://www.stewmac.com/shop/Finishing_supplies/Colors,_tints,_and_stains/ColorTone_Concentrated_Liquid_Stain.html and use a piece of scrap wood to compare the colors. When you think you have got a close match, do a final test inside the pickup cavity or tremolo rout and compare the shades. Remember also a clear finish will brighten up the stained wood slightly so make quite sure before you apply the first coat.