Sentence 1: The first known European observation of Whidbey Island was during the Spanish expedition of Manuel Quimper and Gonzalo López de Haro at the `` Princesa Real '' in 1790 .
Sentence 2: The first known European sighting of Whidbey Island was during the 1790 Spanish expedition of Manuel Quimper and Gonzalo López de Haro on the `` Princesa Real '' .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?