ESP32C3 Eco4 details ?

[MasterPhi]

We are developping a product based on ESP32C3 Eco3, I saw there is new commit in esp-idf of "Adds ECO4 revision".

So is any document explaining the difference ?

[MasterPhi]

Any Espressif employ can answer this question ?

[WiFive]

https://www.espressif.com/en/support/documents/pcns

[Hackswell]

https://www.espressif.com/en/support/documents/pcns

In English, to me it reads:
"We didn't change any functionality. We just rearranged some stuff to get a better yield on the fab process."

Could be re-routed parts of the CPU/peripherals, redundancy, smaller lithography. Who knows.