Bank 1 Senor 1 is the sensor before (upstream) the Catalytic Converter. The 3.8 has 1 sensor for driver side and 1 sensor for the passenger side. Yes, heated sensor. Below is that sensor. Same sensor for both driver and passenger.
ACDelco Oxygen Sensor AFS109 | O'Reilly Auto Parts (oreillyauto.com)
The 3.8 has just 1 sensor after the Catalytic Convertor.
ACDelco Oxygen Sensor AFS123 | O'Reilly Auto Parts (oreillyauto.com)