Donut shop blends are usually knock off of Dunkin Donuts coffee... mainly Peruvian coffee.
I have both Dunkin' Donuts and Donut Shop coffees for the Keurig when I'm in a rush and I don't think they taste anything alike. I find Dunkin' Donuts to be watery and blah. I find Donut Shop coffee to be quite good, for a Keurig coffee.
I remember my Mother used to love making the Donut Shop coffee in her Keurig. She said it reminded her of the coffee that they have at Dunkin Donuts. When she passed away a few years ago, my sister took Mom's Keurig machine to her house. I regret never trying the Donut Shop coffee when I had the chance. Oh well, I'm sure I will someday.