Thread Samples not working in one of two nRF5340-PDK

Hi, i have two nRF5340 DK that i'm testing with the Thread CoAP client/server samples.

I found out that with the newer DK, both the clinet and server samples work. With the older, after flashing in the code, it doesn't respond to commands and the leds don't switch on. However if i try to flash the blinky sample in both the DKs, it works!

How is this possible? What i can do to solve this situation?

Thanks

These are the DKSs' informations:

Newer DK

PCA10095

2.0.1

2022.36

1050097428

PAC10095

0.8.0

2019.50

960142228

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