Interrogation (also called questioning or interpellation) is interviewing as commonly employed by officers of the police, military, and Intelligence agencies with the goal of extracting a confession or obtaining information. Subjects of interrogation are often the suspects, victims, or witnesses of a crime. Interrogation may involve a diverse array of techniques, ranging from developing a rapport with the subject to outright torture.
"Interrogation may INVOLVE!" hence my statement: They are both the same in different situations .