The wire colors for each O2 sensor is different (see image below). Oxygen Sensor 2/2 matches your list of wire colors. Location of B2/S2 differs depending on which engine is in the car (V8 or V6). B2/S2 is the lower O2 sensor on the passenger side for the V8 and the lower O2 sensor on the driver side for the V6 (B=bank/S=sensor). S1 is the upper O2 sensor and S2 is the lower O2 sensor.
B1 is the bank with cylinder-1. B2 is the other bank.
V6 - The right bank is numbered 1, 3, 5 and the left bank is numbered 2, 4, 6
V8 - The left bank is numbered 1, 3, 5, 7 and the right bank is numbered 2, 4, 6, 8