I imported the texture into krita for resizing. Not certain about dithering in krita, but the model looks almost the same at different resolutions. Maybe it's the distance from camera?
Here in top left corner is original, 4096x4096 16bit.
Top right is krita's 2048x2048 using bilinear filter downsizing it.
Bottom left is krita's 1024x1024 using bilinear downsizing the 2048x2048
and bottom right is krita's 512x512 downsizing 1024x1024 using bilinear filter.
After I put the images together I then down sized it using bilinear filter to 1920