Will 1080p on a 4K monitor look the same as a 1080p monitor of the same size?

[MartinPrince]

I saw a discussion on this and could not come away with a clear answer. I was wondering if anybody more technical can give a definite answer to whether 1080p on a 4K monitor will look pretty much the same as 1080p at the native res on a 1080p monitor, when everything else is pretty much equal.

 

[Kreeeee]

Yes, as each 1080p pixel maps directly to a 2x2 square of pixels in 4K. These 2x2 square of pixels will be the same size as a single 1080p pixel.

 

[MartinPrince]

Thanks. Can windows scaling affect the image?