In this combination, the transformative nature of the Death card is given shape and direction by the Knight of Pentacles. The Death always shows some sort of ending, often unwanted and in some cases unexpected too. The Knight of Pentacles gives us insight on what happens after the ending and what the next stage/step will be. The Knight of Pentacles is about being pragmatic, realistic, methodical and it's also about having a mission, a goal.
The elements of the cards are Water (Death) and Earth (Knight of Pentacles). Water and Earth blend together well, so we coud say that Death's watery nature prepares and fertilizes the soil, while the Knight of Pentacles plants the seeds. The process is slow and gradual since the elements of both cards are passive, but overall, this combination shows progress, even if it happens under stressful circumstances.