Not really. The main similarity is that both roundabouts and four-way stop intersections do not have signals. The differences include: four-way stops yield to whoever arrives first, or the vehicle on the right, roundabouts yield to the left - like a right turn on red - because the circulating traffic comes from that direction. At four-way stops, each direction gets a turn in order. At roundabouts, each driver chooses a safe gap to enter and no driver "gets a turn."