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... I can see from the limited views here a difference in the chin/jaw structure between the two. Houser appears to have a slightly forward tilt to her lower jaw whereas the UP does not. Also Houser has a 'flatter' face, the cheek bones of the UP being more prominent than Houser. Third, I see the brow bone structure being less prominent in Houser. I did not check to see if the reason was given but that would be interesting to know.
ETA the gap on the side of Houser appears wider than that of the UP. jmo
Here are the two straight-on images, scaled and rotated so that they can be dragged over one another for comparison.

The UID's eyes are very slightly narrower than Houser's. Not sure if that is real, or if it is an artist's error.
I don't see too much difference in their chins. There is quite a difference in cheeks, but those appear to be soft-tissue differences, not skeletal differences.
As for the gap "on the side of Houser" (I think you mean between #7 and #8), it could appear wider because her head is turned slightly to her left, resulting in a more direct view of the gap.