Well, given enough time, anything will match. Perhaps though a more expeditious means might be oxylic acid or such? As in wooden deck cleaning agent.

> I am finishing up a stitch and glue mahogany plywood/fiberglass
> kayak. In the middle of the project, I was forced to put it aside
> for about two months. Now I am noticing that the wood that was bare
> and unfinished during that period is darker than the wood that was
> coated with resin. These places include taped seams and butt joints.
> Is there any hope that the colors will blend together over time? The
> manufacturer suggested not varnishing for about six months, and this
> seems worth a try. Luckily, as with most defects, only a trained eye
> can notice.