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Speculations
Well the angle reentry and speed at collision are very important factor when considering the energy released by the impact.
Operation British was a large scale military operation, so the maybe the colony was directed on a more direct collision course (and they could properly propell the colony).
IIRC, in Operation Stardust the colony entered with a lower angle, and so had much more time to slow down in the atmosphere.
For ZZ I have not watched it yet so I can't tell.
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