29 CCPU Top Wood Type

[Pappabob]

I have an old top wood kit that was purchased +- 25 years ago and would like to modify the side "header" pieces that form the front to rear header pieces over the doors.
Can anyone tell me what type (species) of wood was used for this piece so my modification will match when toe entire piece is stained and finished. I do know it's NOT OAK. I'm thinking it might be "Yellow Birch". ???
Thank you,
Ron