So I got mine, here're the observations:
YL :
dial: is slightly more creamy white with a smooth lacquered texture, bolder print font, lower "swiss made"
subdials: seems to be more recessed and less shiny
hands and markers: more greyish blue, 9 marker seems weird
case thickness: ~12.5mm
crown: flatter tip
strap: black
ZF:
dial: tends to be more silvery and has a coarse texture, higher "swiss made"
subdials: seems to be less recessed and more shiny
hands and markers more reflective in a brighter blue in same lighting conditions
case thickness: ~12.5
crown: rounder tip
strap: blue
ZF on the left with custom strap, YL on the right all stock: