I wonder where this workprint fell in terms of the film's editorial timeline?
The Assembly Cut on the DVD/Blu-ray is supposedly the oldest, complete cut they could find in the archives when producing the Quadrilogy box set, but there are parts of the Workprint that Fincher mentioned post theatrical release (in his very few interviews on the matter) as scenes he wanted to keep in the final cut; specifically Ripley agonising for a long period whether to take Bishop II's offer, which isn't in the Assembly Cut (the version supposedly less free of creative interference). I recall there were a few other instances of this, but I'll have to think about it!