Can Hawthorn tree "volunteers" from seed be grown? Are they true to the parent tree?

I don't know what kind of hawthorn I have but a lot of "volunteers" sprouted this year. I grew redbuds from sprouts this way and they turned out very nice.

Can Hawthorn tree "volunteers" from seed be grown? Are they true to the parent tree?
The Washington Hawthorn grows true from seed. Some of the thornless cultivars may not; I don't know.