Sentence 1: Until May 31 , 1931 , Colonel Seishiro Itagaki , Lieutenant Colonel Kanji Ishiwara , Colonel Kenji Doihara , and Major Takayoshi Tanaka had completed plans for the incident .
Sentence 2: Colonel Seishirō Itagaki , Lieutenant Colonel Kanji Ishiwara , Colonel Kenji Doihara , and Major Takayoshi Tanaka had completed plans for the incident by 31 May 1931 .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?