They do? They're just coloured pixels. When you open a bitmap image on different PCs and screens and display it at 1x wrt the monitor's pixels, you would expect every pixel to have the same colour across every PC/screen, no?
The pixels will be the same on every PC/screen. The perceived sharpness/blurriness won't be–the whole point of the "color fringing" is that the subpixels of any particular display have an arrangement that can be exploited to add additional sharpness: https://upload.wikimedia.org/wikipedia/commons/0/0f/Antialia...
If the display you're viewing the image on has a different subpixel layout than the one that the image was rendered for, it won't look sharper.
