I doubt it. They have a completely different world on Stargirl. With the Justice Society of America rather than the evil heroes which made Earth-2 very similar to Earth-3 from the comics. Meaning the real Jay Garrick on this new Earth-2 rather than Jesse Quick. Though it's clear that the same events happened so at the very least, there is some earth out there that isn't Earth-2 where Harry, Zoom, and the other metas do exist. Either that or those events happened on E-1 with Zolomon.