We read in 1Samuel 28 that the ghost/spirit of Samuel was consulted by Saul.
This is one case where God allowed a medium a witch to participate in what God had to say to Saul through Samuel.
1 Samuel 28:7-8
7 Then Saul said to his servants, “Find me a woman who is a medium, that I may go to her and inquire of her.”
And his servants said to him, “In fact, there is a woman who is a medium at En Dor.”
8 So Saul disguised himself and put on other clothes, and he went, and two men with him; and they came to the woman by night. And he said, “Please conduct a séance for me, and bring up for me the one I shall name to you.”
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The difference is that what Samuel said to Saul did happen.
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1 Samuel 28:16-19
16 Samuel said, “Why do you consult me, now that the Lord has departed from you and become your enemy? 17 The Lord has done what he predicted through me. The Lord has torn the kingdom out of your hands and given it to one of your neighbors—to David. 18 Because you did not obey the Lord or carry out his fierce wrath against the Amalekites, the Lord has done this to you today. 19 The Lord will deliver both Israel and you into the hands of the Philistines,
and tomorrow you and your sons will be with me. The Lord will also give the army of Israel into the hands of the Philistines.”
1 Samuel 31: 1-6
31Now the Philistines fought against Israel; and the men of Israel fled from before the Philistines, and fell slain on Mount Gilboa. 2 Then the Philistines followed hard after Saul and his sons.
And the Philistines killed Jonathan, Abinadab, and Malchishua, Saul’s sons. 3 The battle became fierce against Saul. The archers hit him, and he was severely wounded by the archers.
4 Then Saul said to his armorbearer, “Draw your sword, and thrust me through with it, lest these uncircumcised men come and thrust me through and 2abuse me.”
But his armorbearer would not, for he was greatly afraid.
Therefore Saul took a sword and fell on it. 5 And when his armorbearer saw that Saul was dead, he also fell on his sword, and died with him. 6 So Saul, his three sons, his armorbearer, and all his men died together that same day.
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You would be hard pressed to find another example in Scripture but the difference is that what the spirit of Samuel said did happen. God allowed the spirit of Samuel to communicate with Saul.