Most stains sold in home improvement stores have samples on oak, pine, and sometimes maple. I was probably the one that recommended Stain Putty---for filling small nail holes in finished molding, I simply wipe off all the putty on the surface of the wood, looks fine when dry. Remember, when using Stain Putty, the wet mix is a lot darker than the dry filler. I often find I have to mix a bit of filler to match some color---it can take a couple tubs of Stain Putty----and I buy several 6 oz. cans of stain. But, if you have the stain the cabinet maker used, try that first.

Go to HD, or an Ace Hardware store, look in the stain department for a product called Stain Putty. It comes in a plastic tub with a brown lid---about 6 ounce size. It is a powder that is made into a putty by mixing it with the stain used on the wood needing the nail holes filled. It will be a bit darker when moist, but will dry to very close to the stained wood color. You can sand it and put whatever finish on the wood you want.

It has been my experience that if a really good match---like with the Stain Putty---is not possible---like trying the color sticks/sawdust and glue/---making the filler lighter is less eye catching. I did several hundred feet of pine crown molding, stained dark walnut. The home owner specificially mentioned he wanted no conditioner---he wanted the color differences from the stain to show. And with even good stain grade pine, there was a LOT of difference. It was in a room with 7' ceilings and a soffit for HVAC in the center the length of the room that was 10" below the ceiling. I used a 16 gauge nailer and had a lot of nail holes to fill. I made up two batches of Stain Putty----one with the dark walnut stain and another with pecan stain. The dark walnut Stain Putty was a perfect match for the darker areas---but would have stood out like a sore thumb on the lighter areas. The pecan was a bit lighter than the light areas and was a fdair match---the HO could not see the filled holes----and he is a professional painter---has owned his own company for 30 years.

My GC used this http://www.flextrim.com to trim out a round window in my bath. It can be painted or stained and wood putty to fill nail holes and seams.