Question Core Temps Vs. CPU Package Temps - I5-9600K

[Arekino]

I have I5-9600K with Asrock Z390 Phantom Gaming-ITX/ac(BIOS 4.0). Why do I have such a large temperature difference ? Core Temps Vs. CPU Package Temps ?
At idle and in the stress, it's about 18 degrees.
Is my board has somewhere different temperature sensor?

 

[Zephyl]

The package temp is read from the die itself, and most core temp readings come from elsewhere (often within the socket of the motherboard).