The theme that these two excerpts from Franz Kafka's The Metamorphosis have in common is the metamorphosis of Gregor from human to insect.
Explanation:
These two excerpts talk about how the transformation will change things around in a drastic way, there are some lines that support this idea such as "all this peace and wealth and comfort should come to a horrible and frightening end" and "he must show patience and the greatest consideration so that his family could bear the unpleasantness that he, in his present condition, was forced to impose on them"