Generally, if it works at all, the software is compatible. Do you happen to know what version you were on before you sent them in?
What is the Garmin configured to show? Track?
Also is the Garmin configured to display true bearings or magnetic bearings?
If it's for track and magnetic then of course the Dynon heading will be different from the Garmin track by the correction for the wind speed.
In the first picture you have a tailwind / from the left. It looks like quite a stiff wind at that: 40 - 55 mph? (Can't be bothered to get the whizz wheel out...)
In the second you have a tailwind from pretty well dead astern at about 30mph.
I think my figures are about right.
Having the Dynon in mph and the Garmin in knots is making my head hurt a bit! :-?
If you have the Garmin connected to the Dynon (or Dynons if you are DSABbed up) and an OAT probe installed then you could turn on the wind indication on the Dynon.