Sentence 1: Prior to the unification of South Yemen in 1990 , the law set the minimum age of marriage at 16 in Yemen and 15 in the north .
Sentence 2: Before the unification of Yemen in 1990 , the law set the minimum age of marriage at 16 in South Yemen and 15 in the north .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?