Take a scrap of similar wood and darken it up to match. Sand darkness into powder. Mix with glue. Test to see what color it dries, and to make sure it doesn't have any compatibility issues. Then do the real one. Don't leave ANY glue on the surface where it will alter the texture. Best to not let any contact the surface. Anyway that's what I'd do. YMMV, and others may give better options.
Cherry darkens with time, so, I'd use cherry dust in the glue. Preferrably from the same piece of cherry, with the same finish.
Or, get a perfect fit so the glue line is vanishingly small...
Gerald