Lots of useful info here.
I'll add... normally, I have plenty of bamboo here to choose from, so I can afford to choose a clean piece without deep scratches or dings, and then don't bother to remove the rind until part way through the tillering. But if I only had the two pieces pictured above, I would at least remove the rind around the scratches and nicks to more closely inspect them in those specific areas. If the damage reached into the power fibers at all in areas that would end up being in the bow, I'd hold off and order some new pieces from someone who is familiar with the needs of bowyers.
I would still leave the rind intact everywhere else because it helps protect the bow's back from glue and such.