crxattack

I have an obd1 b16a in a CRX. I just purchased an SG302 o2 sensor for it with the connector. It has 1 white, 1 blue, and 2 black wires. My conversion paper tells me to wire:
blue wire to o2 sensor heater(BLK)
white wire to o2 sensor signal(WHT)
black wire to o2 sensor ground(GRN)
red wire to o2 sensor power(BLK)

Now the SG302 I purchased has no diagram to tell me what the wires do. I was told that the blue and white are the sensor signal and ground. And that one black wire is the heater and the other black wire is ground. Do honda 02s have 2 grounds? Or is the conversion chart right? I am confused and just want to connect this properly.

crxattack

Someone has to have gone through this before.

2 grounds?
1 ground?