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It’s not been established (yet) that the Korean flight had a hydraulic failure, I don’t think?
The absence of undercarriage, flaps etc. could also be the result of a crew mishandling the aircraft due to some other emergency (dual engine failure, smoke or fire in the cockpit, complete electrical failure, crew incapacitation for example) taking up all of their capacity, leading to them rushing and missing the usual checks and cues. Or it could have been some other confluence of adverse circumstances.
Just a coincidence that both suffered hydraulic failure I guess