It’s compared differently when matching in-species. In this case, 93% is closer than a sibling (almost close enough to be a clone), unless parents are very closely related.
When you’re matching in-species, you ignore the stuff which is common. Therefore, two unrelated people will have less than a percentage point in common, and children will have a 50% match to each of their parents (not including mutations).
“In reality, however, animal experiments and human accidents have shown that people can likely survive exposure to vacuum conditions for at least a couple of minutes. Not that you would remain conscious long enough to rescue yourself, but if your predicament was accidental, there could be time for fellow crew members to rescue and repressurize you with few ill effects.”https://www.scientificamerican.com/article/survival-in-space-unprotected-possible/
It’s compared differently for genealogy; 50% is a sibling.