Ibn Wahb narrates with an authentic chain that he saw the Messenger of Allah (peace and blessings be upon him) performing ablution. Then, describing his (peace and blessings be upon him) ablution, he said that he (peace and blessings be upon him) wiped his head with water other than what was left over on his hands, but he did not mention the ears.
(b) The second narration is more authentic than the first.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 309