Close but not quite, Blue. I made the same mistake initially.
2K has a maximum spatial resolution of 2048 by 1080 (square) pixels, whilst 4k is limited to 4096 by 2160 pixels, so 2K is roughly equivalent to 1080p and 4K is roughly equivalent to SHDV. There is also 8K (similar to UHDV), but very few currently use it ...
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