They are alike because in Pandora’s Box, Pandora was so curious that she opened the box and all the death and sickness flooded out.
This has a connection to The Monkey’s Paw because the husband gets curious and wishes for 200 pounds. Then his son dies and a man comes to their home and tells them they get 200 pounds. So the husbands wish does come true.
In Pandora’s Box everyone in the world gets effected by Pandora’s curiosity when she opens the box.
The only People that effected in The Monkey's Paw are Mr.and Mrs. White because wish only effected them because of the death of their son.