Dungeon Planet is basically a series of suggestions for re-skinning DW so it’s science fantasy. SWvsM is a specific campaign framework that uses the DW rules. There’s 6 new DW classes, but they each have sort-of-complicated new rules that support their themes. Like, The Lover is in a love triangle with Space Wurm and Moonicorn, and would probably be pretty weird in a normal DW campaign. The really long GM section is all stuff that could be used in a Dungeon Planet game, though, or any kind of sci-fi DW game. It’s just arranged into categories that correspond to the pillars of society that Space Wurm gets to control 2 of.