I noticed that too but the other way around. I have 2019 and drove 2018 on the track. The 2018 was noticeable slower at low RPM than my 2019. Ford achieved this with software upgrade starting with MY'19.
I also had an issue with uploading xml file when I first installed upgrade.
Just now went back to upload xml file to confirm update and it said: " Your SYNC system (SYNC3 v3.4.21020) is up to date". So, I guess the system checked over Wi-Fi without me uploading the xml file.
Can't find Ford's upgrade notes on this. But here what I gather from other forums:
Looks like this update may improve the speed of carplay and sync3 as well as enable you to download the latest version of the maps (NA220).
I'm in Central NJ. Installer did my with Suntec PPF entire front-end(front bumper, fenders, lights, hood, mirrors) for $1700 including paint correction. Later he did A-pillars, front of rear quarters and edge of the roof for $200. I recommend doing entire front-end and at least front of rear...