Surprisingly no - usually they look like clones (as I suspect you have found). Base prompt was “a nude 25yo girl and her 40yo mother with saggy tits standing side by side, ((imperfect skin)), attractive pussy, eyes looking at camera”. I have a preset I use with negatives for disfigurement and cgi and positives for good lighting.

My typical workflow is to do a smaller image (512x768) and expect them to look like clones. Then I inpaint the people separately with smaller adjustments. I just change the prompt to be “two 40yo women” but only update one of the two people using like 0.6 denoising strength.

Deliberate_V2 is my model for this. It is pretty awesome.

SD Upscale to make the higher resolution and use 8x_NMKD-Faces_160000_G as my upscaler.

Now if only I could figure out how to post the images directly vs a text post with an image embedded lol…