Sentence 1: He was also employed by CBS Sports as a regional CBS NFL and CBS NBA announcer from 1976 to 1979 , after which he moved to NBC .
Sentence 2: He was also employed by NBC as a regional CBS NFL and CBS NBA announcer from 1976 to 1979 , after which he changed to CBS Sports .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?