Sentence 1: The Marañón River ( formerly known as Sumatara ) is a large tributary of the Pastaza River in the northwestern Amazon - South American basin .
Sentence 2: The Marañón River ( formerly known as the Sumatara ) is a large tributary to the Pastaza River in the northwestern Amazon Basin of South America .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?