@firstname.lastname@example.org In my experience it mostly seemed to work, including blocks and mutes, though there seem to have been some follows / followers and such that didn't carry.
One thing that doesn't seem to track is other accounts which have blocked you, so that profiles I knew I'd been blocked by hadn't blocked my new profile. (Several of these eventually did, though I may be unware of others.)
I'd say it's 95%+ successful, but keep an eye out for issues.
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