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Shouldn't matter if you have two wires with the same color reversed as they are just for the heater. In fact, you probably would notice no engine difference without the O2 sensor connected or with the heater wire(s) disconnected. Just a chance your carbon cannister would have a 10% shorter life, if you have one.
The heater wires are the only ones carrying any current to speak of so be sure you have a low-resistance solder joint.
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