There is a thermostat that opens when the oil is hot enough to send oil to the front oil cooler or trombone oil cooler. If this valve is closed you will get about two less quarts of oil than with a hot oil change.
This is all you need to know.
I am not an expert, just been around you guys long enough and done a few oil changes each way.
Edit: Is the bottom sample done hot? It has more Zinc in it for sure.