PHP-FPM served by Nginx vs. Apache (again)

After searching and reading all related posts on the forum, my question remains unanswered....
Could someone explain how PHP-FPM served by Nginx vs. Apache works?

The two setups I am testing are:

1. FPM application served by Nginx

Proxy mode = ON
Smart static files processing = ON
Serve static files directly by Nginx = ON
Enable Nginx caching = ON
The phpinfo() output shows: $_SERVER['SERVER_SOFTWARE'] => nginx/1.26.2,

and .htaccess works normally...

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