In Daz it can be simpler, or complicated depending on how the character was created.
You have 2 main components of a character in Daz. The shape and the texture. The texture plays a very big role, sometimes more so than the shape. That is why, it is usually easier to identify the texture than the shape of a character. Because it gives the character already the look. The problem is it also hides certain differences, or modifications and makes it harder for someone to identify.
Her are two images of a quick render:
This is Victoria 7 and EJ Adora (the character with the texture at least for Sophia. I think especially in later iterations small tweaks to the shape were made as well). Here I have changed the textures among them.
View attachment 3013390
Here are the characters with their original textures on:
View attachment 3013392
Yes, in the first image, Victoria 7 with the Adora texture doesn't quite looks like Sophia but it looks a lot more like the character than the actual shape of Sophia with Victoria's texture.
In the second image we can see that Shape and texture combined make for an almost perfect match of how Sophia looks.
This example was to show how much of a character look comes from the texture. With a completely wrong texture, the character looks very different.
It also shows how the texture makes recognizing the shape a lot harder. Yes, when the right combination comes, you can recognize it but I doubt how many people can recognize Victoria 7 in the first image.
Now add to that the fact that shapes can be combined however anyone wants.
The creator can say I want this to have 85% of the Adora shape and let's say 40% of Gillian shape. Afterwards, there are very detailed slider to modify the shape of everything you want, nose (bridge, tip, curve, nostrils and so on), lips, cheeks, jaw, forehead and so on.
Here is how Adora and 85% Adora with 40% Gillian look like side by side:
View attachment 3013401
Can you tell which is which without looking above?
I think the TLDR is: We can maybe identify the texture if we get lucky and stumble over it.
If the creator has played with the shape, there are very small chances we will completely identify it.