The climax takes place at the campus theater, similar to the film, but the reveals and motivations were drastically different.
The final Scream 2 (1997) kept:
This was the knife twist that broke test audiences (in theory). Hallie (Elise Neal), Sidney’s loyal, funny, protective roommate, was the second killer. Her motive was simpler but devastating: jealousy. Hallie was tired of living in Sidney’s shadow. Tired of being the "best friend of the victim." She partnered with Cotton for a promise of fame and a book deal. scream 2 original script