Yes. 4K is 19:10, 2K, is 16:9.
4K is slightly lateral.
4K is unlike HD, there is no unified standard.
The works of YouTube and Netflix are mostly 3840 × 2160
The resolution at the time of shooting the camera is the mainstream of 4096 × 2160.
In Rebester, in order to respond to various resolutions,
4K-DCI is based on standards with high resolutions of the horizontal width.
So, 4096 × 2160 resolution works are produced on the premise of trimming.
Please cut off and use it.