No, these two things are different from each other. Smoke detectors are merely sensitive devices that identify the smoke particles. Their only job is to signal the fire control panel or trigger the fire alarm. On the other hand, red fire alarms either receive signals from the smoke detectors or have sensors that feel the smoke to produce intense-pitched sound. Also, the red light in it flashes to provide a visual representation of a warning. Some state-of-the-art fire alarms help in extinguishing the fire as well.