There where loads of differences between the BigTurbo/Small Turbo change over was mid 1994

Full filler cap to flap as mentioned above
Wing mirrors flappy to tear drop
Extra wind proofing seals on the b-pillar and bottom door frame
Rear Badging positions and type
Certain colours phased out and added ie I've never seen a Pacifica or Polais Small turbo and I've never seen a auralias Big Turbo etc
I think all Small turbos where Lux spec as well ie all had sunroofs and electrics etc

Engine wise Big turbo had the larger T34 turbo and the classic blue cam cover.
Small turbo had a Smaller T25 turbo different Exhaust manifold, different inlet manifold, throttle body, ISCV, oil kidney/flame trap, different head, cam cover, different ignition leads and coil packs, different timing belt cover, oil spray jets under the pistons, different ECU which used different sensors (crank/phrase etc), MAF sensor on the different airbox lid, recirc valve came directly off the turbo, Fuel rails where painted black for some reason on the Small turbos aswell.