Multiple listings for the same brand and type of part merely indicate different suppliers. Unless otherwise noted, they are the same part.
Known as: oxygen sensor / oxygen sensor in front of catalytic converter
"Oxygen (lambda) Sensors 996 / 997 - Pre Cat"
Bosch Oxygen Sensor (oem) for Porsche 911
Bosch Oxygen Sensor - 2 Required for Porsche 911
Bosch Oxygen Sensor for Porsche 911