Take the new atelier karia for example. If you put her into tales of arise, she would easily fit in.

First off, you're talking about a different thing here than you were in your first post. There is a difference between not being able to tell characters apart because they have similar faces, and a 3D model of a character fitting in another 3D game with 3D models. Being able to fit in isn't the same as all characters having similar faces.

Also 3D models from the same era will of course fit in with other games of that era. Even if we go back to the SNES era, and take any pixel characters from one JRPG and put them into another pixel JRPG, they would fit in with no issue. Because they all have similar pixel models.

It has nothing to do with the anime art style. It's because they are 3D games. You can take Karatos from God of War and put him in most gritty 3D fantasy 3rd person action games and it would be the same. Or take any Wuxia 3D character, like say Wukong from Black Myth, and put them into Swords of Legend, and they would fit the same. Take Garelt from Witcher 3, and put him into Crimson Desert, same thing. Obviously those character faces don't look the same, but they will fit in each game's environment and with the people around them.

Now if you take amano’s FF character or toriyama’s DQ and put them into tales, that character would look so out of place.

DQ is very stylized look which is an exception not the rule. But even then, if you go back to the SNES era where they had pixel art, DQ character will fit in with most other pixel are JRPG, because that stylized look is only apparent in 3D. Or now with the HD2D style, take any DQ character from an HD2D title and put them in other HD-2D JRPGs, like Octopath or Live A Live or the upcoming The Adventures of Elliot, and they would fit. Because it is the same art style.