No, you are wrong. The base needs may seem the same as in the housekeeping and metabolic systems on the surface look the same, but they are regulated differently and response to extra and intra cellular signaling absolutely differently. Moreover, cockroaches and humans have many different metabolic pathways, such as we need more supplements (which we call vitamins) in our diet than any other creature on earth, while a cockroach can make Vitamin C and others internally.
We and roaches are metabolically fundementally different--they are poikilotherms while we are endotherms, which arises from striking differences in how the cells metabolize sugars/fats, the speeds of their electron transport chains, and the very permeability of their mitochondrian membranes. When talking about survivability in harsh climates, roaches and humans are so radically different that no comparisons can be drawn. Cockroaches can survive on foods we can't.
They aren't susceptible to the same diseases--likewise there are poisons for roaches that won't harm human beings (newer pest control agents can accomplish this by exploiting the unique physiology of insect cells). They also need far less oxygen, and can tolerate much larger temperature/pressure extremes. Heck, insects use many totally different transcription factors from humans, especially in development and status of the physiology after that.
Afterall, we have an internalized skeletons, while they are protected by chitin--the same substance that your fingernails are made from, and thus have an entirely different growth scheme, timing, and mechanisms even in the adult forms. You are being fooled by minor similarities inwardly. That's why these roaches are on the ship for fun, because they cannot be used to scientifically test for survivability in the ships conditions for humans.
No, you are wrong.
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