Problem: S1: The aircraft was situated on a domestic flight from Goma to Kisangani via Ndjili .
S2: The aircraft was on a domestic flight from Goma to Ndjili via Kisangani .

Do S1 & S2 convey the same information?

A: no

Problem: S1: Didkovsky has composed or performed for a number of CDs , including :
S2: Didkovsky has performed for or composed on a number of CDs including :

Do S1 & S2 convey the same information?

A: yes

Problem: S1: He also worked as a translator for Swedish media journalists and a national newspaper .
S2: He also worked as translator for national media journalists and a Swedish newspaper .

Do S1 & S2 convey the same information?

A:
no