Amazon just eliminated one of the few differences between its two POD platforms. Yesterday they announced that authors and publishers who use KDP Print can get their print distributed to US bookstores.
KDP now offers Expanded Distribution to bookstores in the United States. Through Expanded Distribution, you can distribute and make your paperback book available (this doesn’t guarantee that your book will be ordered) to online retailers, bookstores, and distributors. Learn more about how Expanded Distribution works.
If you enable Expanded Distribution for your paperback, the royalty rate is 40% of the book’s list price effective in the distribution channel at the time of purchase, minus printing costs and withholding. Learn more about paperback royalty rates.
Launched in 2016, KDP Print is Amazon's intended replacement for Createspace, one that gives authors and publishers a single dashboard where they can manage both their ebooks and POD books.
They haven't announced a specific date when KDP Print will replace Createspace, but Amazon is expected to reveal that information in a couple months.