Sentence 1: In 1981 , when he succeeded Karlheinz Kaske , Plettner became the first Chairman of the Supervisory Board who was not a member of the Siemens family .
Sentence 2: When he was succeeded by Karlheinz Kaske in 1981 , Plettner became the first chairman of the supervisory board not to be a member of the Siemens family .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?