Problem: S1: The first cosmonaut was the Soviet air force pilot Yuri Gagarin , also the first person in space .
S2: The Soviet cosmonaut was first Air Force pilot Yuri Gagarin , also the first person in space .

Do S1 & S2 convey the same information?

A: no

Problem: S1: It is endemic to California , in the central Sierra Nevada within eastern Madera County .
S2: It is endemic to California , in the central Sierra Nevada in eastern Madera County .

Do S1 & S2 convey the same information?

A: yes

Problem: S1: Some large excess microwave noise generators use avalanche diodes to create a commercial noise figure that can be turned off and on .
S2: Some commercial microwave noise generators use Avalanche diodes to create a large excess noise that can be switched on and off .

Do S1 & S2 convey the same information?

A:
no