Sentence 1: The middle period ( 2600 to 2000 BC ) of the Yellow River culture in the late Longshan area is contemporaneous with the classic Shandong Longshan culture .
Sentence 2: The middle period ( 2600 to 2000 BC ) of the Yellow River culture in the late Longshan area is coinciding with the classical Shandong Longshan culture .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?