Gregory's Server
These are completely different instances hosted by different owners.
You can export your followers via settings in Mastodon web application. #MastodonSocial's impact on the Fediverse is overstated - as long as there is a relay server that your instance can depend on, mastodon.social is but one of the noisy figures that can be safely removed. Not without caveats, but, if people you follow don't sit there, it's fine.