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As far as I know:
4096x2160 is 4k
3840x2160 is UHD
But in some YouTube videos treating UHD as a 4k. Example as follow:
Same video detail shows different.
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As far as I know, Youtube doesn't use the UHD abreviation and always uses '4K' for both horizontal resolutions. Happy to be proved wrong though - can't say it's something I've noticed.
Direct from the "4k resolution" wiki page:
The term "4K" is generic and refers to any resolution with a horizontal pixel count of approximately 4,000.[4]: 2 Several different 4K resolutions have been standardized by various organizations.
So it's not wrong to say that UHD is 4k, though I'm sure there would be loads of people who'd disagree.