AFR in Kpro reads differently than AEM Wideband

[DGD_03TypeS]

So I have an 03 RSX type s running the oem prb ecu with kpro v4 installed from humbleperformance and I have an aem x series uego wideband model 30-0300.
The aem wideband isn’t wired into the ecu in anyway so it’s reading the afr’s from the oem denso o2 sensor. Going downstream of my headers, the sensors are oem primary o2, oem secondary o2, then finally aem wideband. The afr readings from kpro are showing a bit richer than the aem wideband’s. For example, kpro reads 14.7, and aem reads 15.6. When I had my car tuned, my tuner said that according to his afr gauge, the aem was correct and the kpro was wrong. He said it might be the oem o2 sensor or even the kpro but I wasn’t sure that what he said was correct because I’ve just had the kpro installed into my ecu and replaced the oem o2 sensor. So he told me just to monitor the aem gauge since those readings are the same as his. So I wanted to know is it normal for the two to read differently and if it’s not, what do I need to do to get them reading the same.

[Spunkster]

They may read differently depending on where they are located or due to how they are wired. There is no adjustment you can make to the OEM reading.

[DGD_03TypeS]

Is it better to replace the oem sensor with the wideband to get a more accurate reading? Or is it better to run the afrs off of the oem sensor?

[Spunkster]

The OEM is a wideband and works very well.