Down grade Pixel 4a 5G, SQ1A.211205.008 current version (android 12)

So I have android 12 on this Pixel 4a 5G, (SQ1A.211205.008 current version, android 12).

How do I know what is the previous version to return to. I found this link:

I am unsure of the last carrier but the phone is unlocked. What version 11 to use?

Regain your privacy! Adopt /e/ the unGoogled mobile OS and online servicesphone

take the lastest one.

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So then this one: RQ3A.211001.001, Oct 2021.

The .001 after has not bearing on my phone being .008 I assume?