Changing color of finished wood

I got a door from a neighbor who's remodelling. We have the same builder, so the door and trim are the same style as my house. The problem is, the finish is a different color. Mine are walnut, his are oak. There is also at least one coat of polyurethane on the door he gave me. Can I make his door look like the same finish that's in my house? If it helps, I also have a couple of pieces of trim he ripped out on which I could test to see if the color matches.

 

You will probably need to strip the door and restain. They sell tinted poly but to go from light to dark would be a lot to ask of it.

 

"The problem is, the finish is a different color. Mine are walnut, his are oak."

You do not say if the wood is different??

 

Everything is the same except the color of stain that was used - same exact door.

 

i would ask the builder for the exact stain used on your door.
then strip the door,sand and stain and top coat.
you can use poly or u can use an outdoor varathane which has some
flexability. use saw horses that are padded to protect the "inside"
of the door while you work on the "outside" of the door.
or you can clean and scuff sand the door and try the "pre stained"
poly. buy a small amount in the colour that comes closest to your
existing door and try it on the trim from your neighbor.

i prefer to strip sand stain and clear coat. sometimes the
pre stained poly can be streaky when applied.
of course it could just be me.

make sure the replacement door fits first before doing any work on it.