Its a known thing, being unable to 'unsee' or 'unhear' a specific thing that bothers us.
I will say, its not some strange Nvidia sauce and its not really different on the AMD side. What you're seeing is the culmination of different video settings either canceling each other out or supporting each other. With all the different ways to get settings done, its not always easy to get right. Additionally, games take more and more out of your hands that deny good AA, lots of post effects but also shadow and lightmaps, motion blur, chroma effects, etc etc. They all mess with pixel color and not everything is AA'ed in the same way. And amongst all of this, certainly some specific games will be looking different on different GPU brands. Or even generations of the same brand, as new features creep in.
Its what I was trying to tell earlier. Rendering is not perfect. Try to enjoy the game instead of counting pixels. The easy fix for that: don't crawl into your monitor, sit a good arm's length away from it. On most regular display diagonals that gives you the sweet spot for pixel density.
What diagonal is your 1440p?