no, accounts are completely separate.
piefed does have some social auth support, which is currently also being worked on, but lemmy is not an auth provider that can be used with that. once social auth in piefed becomes more stable we will consider enabling it for supported providers.
Syrc@lemmy.world 8 months ago
(Although adding to the other comment, since it’s federated, you can see and interact with all of Piefed’s content from Lemmy and vice versa)