The DNA card speaks of Karma. It speaks of not just connection to the dna from family but of also a soul dna that brings about lessons we must learn. We must choose to evolve to reach a higher level of consciousness.
The Ancestors card speaks of the link between generations...for better or for worse. We aren't slaves to the pattern set before us by our ancestors but they do help form who we are. When this card shows up it is asking you to call upon this connection, ask those who have been before you for help. When I get this card in my own readings I often think of the saying, "those who do not understand the past are doomed to make the same mistakes" (paraphasing).
Both very interesting cards and while they don't have that atmospheric nature about them, they do have that connectedness about them. I think Earth Magic, more than any other deck I have, speaks to that connectedness...to the fiber woven between people, to nature, to animals, to past, to present and then future. All woven together into a beautiful, messy tapestry of life.