There were three hardware revisions shipped as “Evergreen” so far:
1.0.2 and 1.0.3 differ only with minor layout changes to ease production, schematics are the same. Subrevisions that append “.1” at the end (1.0.3.1 and 1.0.6.1) denote devices that include improvements for GPS sensitivity (it’s just a component placement change, the PCBs are the same as versions with no .1 at the end, so that change could be done mid-production).
1.0.6.1 is the currently shipping version. It has some changes around antennas to accommodate for changes in the casing (IIRC L5USA is still based on 1.0.3.1 because it’s currently still using slightly older cases). It also has a change for DP AUX signals that could potentially improve compatibility with some USB-C peripherals. There are also some changes regarding used components, but those are functionally equivalent.
For the record, 1.0.6 is the revision that went through FCC certification process.