. . . other than size might be the shift in symmetry. The original evinces slanted symmetry with identically sized constantly running seconds and chrono hours counters at a 45º angle to the center line, accentuated by date aperture placement ~ 120º from top dead center. The revision, by contrast, has the identically sized sub-dials perpendicular to the center line, and the date aperture in line at 180º from tdc.
This 'centering' effect causes the subliminally perceived differences between the two, imho.
Art