There are quite many small details.
Pandatrooper on FISD found some of these differences:
Overall
- everything looks more chunky and symmetrical, less fitted and curvy / sculpted
- The cover strip areas seem to be overlapped and the strips themselves look wider in appearance.
Helmet
- the cap to back line is very sharp, might even be separate?
Back
- very sharp and "boxy" sharp edges to the OII box
- shoulder straps have an angled receptacle molded in
- there's a snap visible just past that receptacle
Chest
- chest to back has a black connecting piece underneath (plastic?) it's shiny in one shot
Kidney
- angled slot opening on the side?
- the back box or raised area seems to look like a separate piece
- not very "curvy", it's very straight and FX like
Belt
- is solid belt instead of canvas
- there's no angled cuts on the corners
- Thermal detonator looks different in details, the O button is bigger and sharply pronounced etc.
- thermal det looks rotated lower, and no visible straps
- end caps have a grey center
- belt has a separate swivel opening on the side closure
- drop boxes don't have visible elastics
Shoulders
- look very FX and round / cylinder like, there's not much swoop to them
Biceps
- open on the underside
Forearms
- shape is very straight
- they seem to open underneath too
Hand guards
- have a much sharper slope to the thumb side
Ab / cod
- the cod is very V shaped and angled from the front (probably for ease of movement)
- in the explosions, the cod and butt aren't strapped together but perhaps thats for stunt safety?
Thighs
- totally different shape
- there's a notch on the outside, but the inner top is very round / tube end at the top
- lower edge shape is different
- thigh ammo strip is mounted higher up
Shins
- shape is quite different
- some have notches cut out in the back
- knee plate sticks out
Boots
- they look like they have a tan sole with a pattern molded in
