Its the same engine and the same rendering style, the same time period , by the same developers. Of course it bloody looks the same.
However. Lets jog your mind. What game made today looks lke this? Solasta doesnt, Kingmaker doesnt, Black Geysir also doesnt. None of them do.
Not even ToEE looks like this. Nothing does because the "look" is specific to the way it was made.
You cannot achieve this lookw ithout beeing pre rendered and having sprites.
At this point, you migh taswell say Warlords Battlecry 3 is a better successor to Baldurs gate because it looks closer. Which it does.
Think of it this way, lets say you show a screenshot of the wilderness of Baldurs Gate and another of the wilderness of Icewind Dale to someone who isnt familiar with the genre. My guess is that they would think its the same game except in the snowy screenshot the party has travelled to another area up north.
If you do the same thing for the other games you've listed it becomes quite clear that its not the same. All modern games cRPGs are inspired by the Infinity Engine games and thus will emulate certain elements and visual styles. To say a game from 1998 doesnt look like a game from 2018 is absolutly true, for obvious reasons, but I dont think its a stretch to imagine if BG was made in 2018 it would look kinda like PoE and PF:K.
And the visual style of D:OS stands out in this regard. Atleast from my perception.
