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Hi Guys, Does anyone know if there is a difference between front (upstream) or rear (downstream) O2 sensors on my Honda CRV 2001?

Not long brought the car, the guy who had it before me put a new exhaust and Cat converter on it but didn't change O2 sensors and just had engine check light come on with code P0420 reading cat deficient Bank 1.

Any advise please?
thanks
 

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I have never had to play with the ones on mine, but I do know I have read several reports on here saying if you replace them to use OEM Honda or Denso brand. The other ones (mainly Bosch) will not work right and the error code will be back in less than 6 months.
 
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