Okay, I'm not saying the two are the same. The timeline doesn't add up for that and there's nothing I've read so far implicating that from Jackpointers/Shadowlanders, etc. Though, Hestaby first appeared in 2053, while the Dragonfall story has taken place in 2054. Of course Dragonfall was written a lot later than the original books.
However, according to Lofwyr's remarks in the end of Dragonfall, Feuerschwinge was a quite benevolent dragon toward metahumans back in the day and very closely connected to the gree. She even got mad after awakening because she've seen the damage humans caused to the planet.
Menwhile, Hestaby has a penchant for awakened beings and metahumans and has a very serious green agenda too. Their coloration is also somewhat close, I think.
So, maybe they are siblings, or something?