Yeah, while the Korvichai have changed their nation name, their democracy (just by a bit, though) and their home planet. They generally wirk on the same technologies, but on more creative applications of the same knowlede that generally changes their technological achievements. Also, they were almost destructed back then, which makes most nation think they actually were. However, yeah, the Korvichai are fans of tradition and managed to keep most aspects at least similar to that period, while their anatomy barely changed for some reason (I quess it is more acceptable when your race's organic elements contain ferrum and aluminum.)

Also, the reason all those myths are so accurate is, in fact, because they were not myths at all. The mythology of those nations was created when parts of the history became so ancient, some historians started dismissing them as mythology with, establishing their theories by some quite convincing characteristics of that history. So, mythology at that era is basically history noone believes actually happened.