I also agree that the IDQ lady in question does remind me a bit of Mary Cooper... maybe her with a wig perhaps? I dunno.
I color corrected the original slide/photo as best as I could and placed the two side by side in a similar pose. The scar and the hair are the two major differences but the boobs, body type and facial structure are very similar. Without any additional photos, I cannot be certain but there are a lot of affinities between them.
Pal replies: you've gone above and beyond the call of duty burpman! Thanks!
Based on your comparison, I am tending to think the UnID subject *IS* Mary Cooper. True, some birthmarks don't match (which could be attributable to airbrushing, makeup or simply the passage of time between the two images) but several other birthmarks do match, and as you point out, physically, they're very similar. So, I'm going to mark this solved (and again, you have my appreciation
and on the off chance someone comes up with a substantiated different ID, we can always edit the thread. 