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Does anyone know if there is a difference in the rear o2 sensors (B1S2 vs B2S2) on a Gen 2 V6?

I know the connector is slightly different, but is the pin out actually different or the internals of the sensor?

I ask because i can buy a right connector for $34, but the left is $100. I can easily modify the connector to work ie: grinding off the extra plastic on the clip to make the connection fit.
 

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The internals wouldn't be any difference, but I'm not sure if the wiring pinout is the same (it probably is, but I'm not 100% sure). You can get the left downstream sensor from Rockauto for $73 (NTK brand).
 
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