The fact is, that civilian life in the Imperium is just like civilian life in real life; it is infinitely varied.

You have different classes, different jobs and responsibilities and different cultures/life styles.
The average catachan and krieg citizens are going to be very different; even hive worlds like Necromunda and Ververhive are very different.

From slaves and gangers, to the low and middle class, to the high houses and noble houses; settlers, miners, survivalists: it all depends on the world you come from in the vast Imperium.

and don't forget the administratum workers; desk clerks make up a large amount of the working population.