One of my favorite things about getting really deep into someone's discography is how you can pick up on little things they recycled, accidentally or intentionally. In the latter case it can be used almost as a musical plot device, to tell a story over the span of decades.
I've come to understand that the Harvest -> Harvest Moon trajectory also includes Comes a Time, and since that realization I can hear their similarities throughout the entire record. In the case of these two songs, the riff is nearly identical, just played at a different tempo. The apocalyptic (?) imagery of creatures and fire introduced in "Goin Back" is recalled in "War of Man," but it's more mature, developed into a borderline hopeful story. "Living in our sleep" is replaced with a little girl dreaming of taking to the sky. "Nowhere to stay" becomes "the safety of a mother's arms."
And yet, I can't find a third positive example, because the other major change in tone is that the source of all of the destruction that persists is now given a name. The "gas and machines" that presumably gave rise to whatever devastating situation threatened these creatures and set fire to the skies are just the tools of mankind and the war we're waging with the planet. The relatively accepting "now we do what we do" becomes an outcry, knowing that if we continue as we're doing, "no one wins."