It's a pain finding out just which one controls what, not sure if it's in a bentley or etka manual maybe.
Here are some links i found of the part you're referring to...4B1 820 511...note the lack of an alpha number code at the end
Appears to just control the driver footwell though, and I think from reading about the other A-passenger footwell, C-central/dash flaps, and D-fresh air part options that you replaced, SOME of those also control the drivers side vents, probably dash and defrost, just not driver footwell? Driver and passenger footwell appear to be separate.
https://www.audiusaparts.com/oem-par...otor-4b1820511
https://parts.audiusa.com/p/Audi__A6...4B1820511.html
https://www.ecstuning.com/b-genuine-...eft/4b1820511/
So my guess is you will get cold air through the dash vents, and defrost vents, but not your driver footwell. Wouldn't be the worst, just toggle off the footwell fans so it's not blowing warm air at least.
Luckily i've got another car to drive as it this problems sucks when it's 90+ out...my footwell and dash drivers side blowing full on warm air, all passenger vents nice and cool, doh!