I think Dolt is closer to Neon/Xata. But still there are differences.
IIUC, Dolt is bringing the database feature to Git, while Neon/Xata is bringing the Git feature to database.
Speaking of Bytebase, if Dolt is really good at versioning schema migration, Bytebase value proposition will be a bit less attractive, but not much. It's similar to the Git story, regardless how powerful Git is, people still need GitLab/GitHub for the developer workflow on top of the mere versioning.