Yes, this is about ~230 years after that. The Year of the Four Emperors was a year in which four emperors reigned in sequence - Galba was overthrown by Otho, who was overthrown by Vitellius, who was overthrown by Vespasian. Think of the Year of the Four Emperors like a year-long civil war, or a series of coups.
The Tetrarchy was a formalized system wherein four emperors would rule simultanously, each delegated a specific area of the Empire to rule over.
This different from the year of four emperors in the chaos after Nero?
Yes, this is about ~230 years after that. The Year of the Four Emperors was a year in which four emperors reigned in sequence - Galba was overthrown by Otho, who was overthrown by Vitellius, who was overthrown by Vespasian. Think of the Year of the Four Emperors like a year-long civil war, or a series of coups.
The Tetrarchy was a formalized system wherein four emperors would rule simultanously, each delegated a specific area of the Empire to rule over.