There are two many big differences to enumerate, but a couple more important ones:

Guantanamo: "As of August 2013, 164 detainees remain at Guantanamo"

North Korea: "When Shin worked in the garment factory and accidentally dropped a sewing machine, the foreman hacked off his right middle finger just above the first knuckle as punishment"

http://en.wikipedia.org/wiki/Kaechon_internment_camp