None of these consoles is actually 4K.
The term "4K" is originally the name of a cinema standard, which has 4096*2160 pixels.
A 4K image is either 4096 pixels wide or 2160 pixels high (or both), but a 4K screen must have the full 4096*2160 to be compliant to the standard.
The television standard's real name is "Ultra High Definition", abbreviated as "Ultra-HD" or "UHD". It is only 3840*2160.
Some 4K images do fit inside that, but not all. A UHD screen is therefore not a 4K screen.
A "4K TV" is just a marketing term to sell UHD TVs, because it is in the "same order of magnitude as 4K" or "about the same as 4K".
Real 4K monitors do exist, but they are often very expensive, and they also tend to have better support for the colour space in the cinema standard.
The only somewhat affordable screen I know of that is 4096 pixels wide is the one inside of the late 2015 21.5" Apple iMac, at 4096*2304 pixels. It even has support for cinema colour space.