Problem: S1: It consists of two parts , Zemendorf and Stottera , both of which lie on the River Wulka downstream from Pottelsdorf and upstream from Antau .
S2: It consists of two parts , Zemendorf and Stottera , which are both downstream from Pottelsdorf and upstream of Antau on the Wulka .

Do S1 & S2 convey the same information?

A: yes

Problem: S1: Helicopter pilot Gary Pfitzner and photographer Bill Strothman were both killed in the crash .
S2: The helicopter pilot Bill Strothman and photographer Gary Pfitzner were both killed in the crash .

Do S1 & S2 convey the same information?

A: no

Problem: S1: He held various positions at Wang Laboratories before joining IBM in 1981 .
S2: At IBM he held various posts before joining Wang Laboratories in 1981 .

Do S1 & S2 convey the same information?

A:
no