Both Pandora and the old guy was curious about what each thing was. Pandora was curious about what was inside her box that was under the bed. The old guy was curious on whether
They all got bad feelings from opening the box.
Both Pandora and the family let curiosity get the best of them. Pandora opened the box and let out all bad feelings into the world so that the humans can feel them.
Both stories had similarities and both had differences in the monkey's paw it had life and death consequences. In Pandora's box the consequence was not really life and death it was just feelings that were negative.
In the monkey's paw it was more life and death. We see this because the boy died after the first wish was granted.