From my view the second picture looks like dry wild cherry-the bark is hard for me to see completely clear.I use wild cherry alot.First pic might be hickory but aged.Looks like some spalting on wood from exposure and moisture.Both woods look aged... i would do a burn test etc. and see how it smokes.Good luck.
Looks good, light it up! One way to tell if you are unsure, at the tail end of your next smoke, throw on some brats and a chunk of your wood. Judge by the smell of the smoke and taste of the food. You should be able to smell cherry smoke, and same with hickory. Then taste the brats that come off, and go from there. That way you don't waste a whole brisket or butt just to find out you have a noxious wood.