Well this came up just now in a facebook post, which made me finally dig a little more into it.
The SSP/repair manual only shows the one in the oil pan. It shows 2 pressure sensors in the oil filter housing, nothing about another temp sensor. My casual observation is that the instrument panel one lags behind...both when warming up and cooling down. The instrument panel value may simply be delayed / averaged out.
It's not uncommon at all to lag/average out instrument panel gauges to avoid big spikes and stuff. My other car has oil temp and pressure in the cluster and it's definitely more laggy and smoothed out vs actual logged values.