Based on how this looks, it's just the digital base game + the dlc included. No other changes, other than performance tuning for the Switch hardware. Basically like the Slime Rancher "Plortable" edition
I can't find any explicit statements. But I am certain that the normal edition is the base game and the Archaeologist Edition includes the Echoes of the Eye DLC. I doubt there is any new content. Also it would not be possible to have the DLC on it's own, if I understand your question correctly