wiki wrote: The 1st and 2nd wood colors are determined by the Primary and Secondary wood blocks, whereas the 3rd and 4th colors are determined by the Primary and Secondary wood boards.
Seems right to me.
Edit:
1(prim block)- Hazel ~ 50
2(prim block)- Hazel ~ 50
3(secd board)- Spruce - 35
4(secd board)- Golden - 25