The gap is due to paneling install over drywall and I am re-installing trim around windows and door. The trim only has clear coat, so painting caulking does not appear to be a solution here.
Most silicone caulk manufacturers make caulks in a handful of tan colors:
If none of those colors match well enough, you could try looking for some wood putty. Some putty dries hard; some doesn't. Here's one possibility.