The implications that Sorawo resembles Satsuki seem to be there more to hint at part of the reason Toriko got involved with her in the first place, and maybe why Kozakura accepted her involvement, rather than to suggest a link between Sorawo and Satsuki - there's no indication anywhere that Sorawo's past is somehow linked with Satsuki, let alone that they're the same person. Probably also to mess with Sorawo's head regarding her relationship with both Toriko and Kozakura - it's that kind of story, after all.
Sorawo's past /is/ definitely linked with the otherside (or with something /like/ the otherside, or something linked with the otherside itself somehow - as with so many other things in this story, it's not entirely clear what it all means), as revealed in volumes 3 and 4 of the novel.