The original patterns were created by "making do" with scraps - don't stress too much over the fabric choices.
Don't forget, this is supposed to be fun!
If you're using reproduction fabrics, make sure that there is enough contrast to make the elements of the block stand out. You could take a black and white photo of the fabrics side by side and see if there's enough contrast. I'd do this for each individual block - picking each of the sets of fabric. It can help you decide.
I have the book too and love the underground railroad quilts. Now you've got me thinking that I need to make one......