The biggest problem, that adds the most confusion, is the original film had a purple tint (deliberatly no less), and it threw all the coloring off, from the bluish black tint of the packs, to the grey of the flightsuits. While this transfered okay to the first DVD, the newest (greenslime art) is a whited up version, which makes everything look washed out. You can really see the dyeing in that version. Think tie-dyed flightsuits (hotel entrance).
One of the best pieces of proof is the great series of photos taken for Time magazine. These are the New York suits, and are the best looking of the two types; LA being the other.
TO get a great look at this, head here:
http://www.ernie-hudson.com/store.html
Even in the thumbnails, you can see the differences in color from GBer to GBer. If you want, pick up a copy of that stairwell Time photo. They're printed from the original negs, and are flawless in every detail. Every flaw on that front pack's visible.
You can always tell the difference in suits by where they are in the films too. A solid example being the final battle. Outdoors and pretty, New York. Busted street, and inside, LA. You can also tell by the circuit boards on their belts, and the condition of Danny's Ecto goggles :lol.
Heck, even the Elbow pads are different from GBer to GBer.
While GBProp.com is about to upload a gazillion great photos, noone's actually complied a definate list of differences. One of the ugly side effects of GB propping is that a 'its good enough' attitude prevails . . .
Your best bet for total accuracy, is pick a scene, disect with help, and go with it!
Looking forward to your results!!