In both the Monkey's paw and Pandora's box both of the outcomes from curiosity had negative effects on the characters.
In both The Monkey's Paw and Pandora's Box curiosity get the best of the characters.
In Pandora's box, Pandora was not thinking at all while opening the box, but in Monkey's Paw, Mr.White did not wish for anything huge, only wished for 200 pounds, so he was being thoughtful.
In both "Pandora's Box" and "The Monkey's Paw" curiosity ruled. But in Pandora's Box Pandora hid the box under her bed to try to stop her curiosity. On the other hand, in the Monkey's Paw, the paw was on the middle of the table.