Post-apocalyptic world where the Science might get back the old world, but a fantasy or unexplained supernatural forces won't let work easy.
-Protagonists are not totally similar, maybe, only the cleverness to make plans and the willpower. But, not the genius in science and the dedication for it.
To me, these shows are 56% similar, even so, they're always good shows.
Both of them have incredibly beautiful nature filled settings.
Both have brilliant visual presentation and incredible landscapes and backgrounds, with stunning greenery.
Both have themes of humanity going against the forces of nature.