The sources used for many of the stories are few. Hesiod, linkHesiod, is a major source for many of the myths of his time, if there were differences in the tales between the city states he was from (kimiKimi in the island of Evia), it would be difficult to tell.
We can tell that the myths had differences over time in the sources. We cannot be sure if this was due to different poets/bards who told/wrote the stories or different regions had their own versions.
Places like Volos would place emphasis on certain tales and probably embellish the grandness of the ArgonaughtsArgonauts.