$ sha1sum *.gcd
8af1e34ab18b2fffcffa7054fd503e6d2a022059 MARQAthlete_310.gcd
95aa161159763fc5a05457528c0076c20d317b70 MARQAviator_310.gcd
8af1e34ab18b2fffcffa7054fd503e6d2a022059 MARQCaptain_310.gcd
8af1e34ab18b2fffcffa7054fd503e6d2a022059 MARQDriver_310.gcd
8af1e34ab18b2fffcffa7054fd503e6d2a022059 MARQExpedition_310.gcd
So technically, Garmin would already be able to let us switch between the different "themes", e.g. "Expedition", "Athlete", "Driver" or "Captain". The Aviator model has the aviation stuff added, so that's missing from the other ones, though.