hold on... it's Kraft paper, not craft paper. Kraft refers to a specific treatment of wood pulp in the paper making process that is designed to make the paper stronger, slightly elastic and resistant to tearing. Kraft comes from a German word meaning 'strong'.
Kraft processed wood pulp is made into paper that is darker in color than other papers and is used for everything from paper used in arts and crafts, to grocery bags and butcher paper. IF it is KRAFT paper, it is all the same thing and the only thing 'food grade' about coated butcher paper is that is designed to keep bacteria out while the meat is wrapped and on the way home from the butcher.
now... using a Kraft grocery bag may not be great because of the adhesives used to hold the paper together. The paper itself is Kraft paper (thicker) but the adhesives are not and may be harmful when subject to heat extremes. I don't have any information on the adhesives though, that is just speculation.
So, whether you purchase paper labeled "Kraft Paper" at the local Hobby Lobby, or Uline, or wwGrainger, or Amazon etc. Old Bill is right... it's all the same thing.
I would also stay away from recycled paper whether it's craft or Kraft!
Read all about what Kraft is here:
http://en.wikipedia.org/wiki/Kraft_paper