Sentence 1: However , its cargo of 267 tons of solid copper ingots was extensively salvaged in 1917 by Benjamin F. Leavitt , and again in 1974 by Gregory James Busch .
Sentence 2: Its cargo of 267 tons of solid copper bars was however extensively rescued in 1917 by Benjamin F. Leavitt and in 1974 by Gregory James Busch .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?