Problem: S1: Finding Russian maps of the city could have been dangerous for Massa himself and for his original sources have been fatal .
S2: Retrieving original maps of the city could have been dangerous for Massa himself and fatal for his Russian sources .

Do S1 & S2 convey the same information?

A: no

Problem: S1: The circumstances of Birinski 's early life are quite indefinite ; different sources offer eight possibilities of his place and date of birth .
S2: The circumstances of Birinski 's early life are quite different ; indefinite sources offer eight possibilities of his birthplace and date .

Do S1 & S2 convey the same information?

A: no

Problem: S1: Kalmah 's sixth studio album was released in Europe on 24 February 2010 , Japan on 2 March , North America on 3 March and Canada on 6 April .
S2: The sixth studio album was released on February 24 , 2010 in Europe , Japan on March 2 , North America on March 3 , and Canada on April 6th .

Do S1 & S2 convey the same information?

A:
yes