completely expected.
"6. Game powered by Ren'Py Engine. Characters and scenes made in Playhome Studio."
no one copied anyone, they both used the assets available in Playhome Studio (which are shared buy a few of the scene-rendering programs used to make these games quickly and cheaply).
... i mean, no one ever mentions that all these games have pretty much the exact same settings menu too, which comes from RenPy>
if devs had to pay to have custom models made, or made themselves (very time consuming) you'd never see a "public release" (ie:free versions), the cost of paid versions would skyrocket and updates would take 4 or 5 times longer. even the girls are standard models, but they usually have more inbuilt customisation options (boob size, face shape, hair type etc) so its not as noticeable, but these programs generally dont have as many adjustments for the male models.
don't you realize that already I mean if you play too many games like this you'll notice most game character models look almost identical to each other, they only differ in their personalities and some body features
These are the model names I've seen so far
Honey select, Playhome, Koikatsu, Emotion creators all are owned by illusion
I believe they used Playhome models here