The two stories are very similar because they are both about the event that happened in the 1940s because of Hitler's hatred for the Jews. There is other concentration camps other than Aushwitzs, but this is the most popular one. Ellie Wiesel went through 3 other camps before being transferred to Aushwitzs. While the doctor was brought there to be the doctor there.
So now, some differences between the 2 people is Ellie was a 13 year old boy from Transylvania. He was separated from his mother and