Heres a few examples of the old molds vs the new molds.
The Black Major new mold on the right of the pic has better defined hands and a new head sculpt.
he is made from harder plastic and stands roughly 3mm shorter than the old version.
his skull and crossbones logo is also different.
It cant be seen in my pics but the old style figure is much shinier compared to the new one.

Chopper has a far superior paintjob and again has the same new hands and harder plastic body parts. Also his pockets and details are much better defined in the new molded version.
Also the head is better sculpted in the new version.
I think most of the force and enemy figures had a resculpt towards the end of the line.
