Technical question - MDH on same FoV but different results

[buttercream]

I'm trying to understand monitor distance matching for stretched resolutions.  Using CS:GO, I've inputted a stretched resolution (1024x768) with default FoV and tried to do a monitor distance - horizontal match with a standard 16:9 resolution but keeping the same horizontal FoV (90 degrees).  Why would the sensitivity be different?  Below is the calculator inputs.

 

[DPI Wizard]

It's different because the configured FOV in CSGO affects the sensitivity (i.e. changing FOV also changes 360 distance). If you tried the same thing with a game like Apex where FOV does not affect sensitivity you would get the same sensitivity:

[buttercream]

 that makes sense, thanks.