^ Well that's just bad naming, since Pyrios is only one horse (not two), and it didn't pull Apollo's chariot, it pulled the chariot of Helios, whose other favorite horses to drag the sun across the sky were Phlegon, Aeos, and Aethon. So the new boosters should at least have different names for left and right. I'd go with calling the two F-1B boosters "Pyrios" and "Phlegon" and Thiokol's two solid boosters "Aeos" and "Aethon". I'd also name the SLS after either Demeter or Circe, who both have some associations with pork.
The confusion of Apollo and Helios is pretty interesting. Obviously Apollo couldn't be pulling the sun across the sky or the world would've gone dark every time he was in the countryside spreading plague, stirring up trouble, or banging chicks, which would be a major plot hole. The confusion seems to stem from the word Phoebus ("bright"), which could refer to Helios, but also was used for "phoebus Apollo." Perhaps this is a bit like confusing the sun with Cher's ex-husband, but in any event it seems to have really taken hold in the Victorian era.