Hello Edward! Welcome to the Disney Parks Moms Panel.
On our last visit, I was surprised by how enthusiastic my daughter was over the Living with the Land attraction at Epcot. I think it's a fantastic experience, but after the thrills of Soarin' (which she was not that into), I had little hopes that a slow-moving boat tour through greenhouses would peak her interest. After her request to ride it for a third time, I knew that I would be booking the Behind the Seeds Tour on our next Walt Disney World Resort vacation.
I empathize with your concern over not-spending twice for the same experience, but the UnDISCOVEREed Future World Tour at Epcot has a completely different focus and itinerary than the Behind the Seeds tour. The UnDISCOVERed Future World Tour focuses on
the history of Epcot, Walt Disney's visionary dream and a behind the scenes look at the park we know and love. Behind the Seeds is
an educational tour based on the natural sciences; looking at plant-life, balancing ecosystems and advanced growing techniques. Based on what I have gathered from Guests previous visits, the closest the UnDISCOVERed Future World Tour comes to Living with the Land or the Behind the Seeds Tour is a ride on the Soarin' attraction (experiences on tours are subject to change at any time, however).
The positive spin I can put on this is that the 2 tours are unique experiences that are focused on different pivotal themes of Epcot. To experience both, you would be required to sign up and pay separately for both tours by contacting (407)939-8687.
I hope you have a magical vacation!