Influence of low cooling water temperature. on ECUs

Hello to each other.

with my AUDI A8 4.2 ABZ, Bj 96 I have a born. Exchange engine installed, since the old had a Pleuellelager damage. With the new "old" engine, the workshop has timing belts/reversers/water pump etc. ==References== Unfortunately, not the thermostat. Now the temperature is only 78-80°C instead of 90°C. Presumably old thermostat from the other engine defective or perhaps installed wrong. I don't know, but I googled and for a sub-contractor, the standard thermostat for the V8 4.2 was offered 80 °C and for the heatlabile a8 motors.

Does anyone know if this 10°C temperature difference really has an influence on the ECUs (gear/defense) ?? If so, which one?

The ECUs really work according to the scheme 90° = warm = normal range.

below 90°C = engine cold = control times/detonation etc. change = gear change = petrol consumption higher, etc.

There must be tolerance limits or working areas for the A8 4.2 ABB which are as i.o. Engine from x°C to y°C = normal.

Thank you
greetings
Uwe