To me, the first seeks to answer the question: why are humans so different from anything else in creation? The second seeks to answer the question: what does our difference from the rest of creation mean for human beings? Adam was specifically created to tend to the Garden.

It might be possible to read the first as describing creation culminating in the appearance of Homo erectus, while Adam is the first Homo sapiens. Perhaps there is a faint collective memory there of the time when both walked on Earth?