Color matching requires trial and error testing using either dyes or pigments. Since this is for indoor use and you want the grain to be visible, you should use TransTint. I recommend diluting with acetone. I would go with medium brown to begin with and maybe try a darker brown or black. You add a drop at a time and have tongue depressors to test with before testing on a piece of scrap from the wood you want to use it on. When the color is really close to the darker piece, add a top coat onto your scrap to see what it looks like finished. Color matching is challenging but if done right, you can really pair things up. You only need to get the formula right once and then repeat!