Answer: The similarity between "The Story of Baba Abdalla" and "The Stone" is that both of the main characters are rewarded for learning lessons.
Explanation: In the story of Baba Abdalla, the king realizes towards the end of Baba Abdalla's narration that he has learned his lesson and generously promises him to take care of his expenses. In 'The Stone' (the story of a man named Maibon who doesn't want to grow old), Maibon realizes that his wish to never grow old is causing him more pain than benefit and thus wants to get rid of the stone. The magical red dwarf realizes that Maibon has learned his lesson and allows him to have his normal life back.