Seems increasingly likely the other site will be going down soon!

Don’t forget there’s a tool you can use to find the Mastodon profiles of folks you interacted with on the bird site! It can generate a csv of all the Mastodon handles in the profiles of those who you follow, share lists with, or are followed by! You can import it to Mastodon, easy peasy, though it needs the bird site to be live, may not be forever unfortunately! Check it out here: https://fedifinder.glitch.me/