There is no clear cut between them.
In both, there are members (states, organizations) that can, to some degree, self-govern. And there are central government, that decides matters of overall importance. However, there is no universal standard on what’s overall important and what’s only locally important. Each (con)federation gives different powers to the central government. You’ll have to read their law, charter or treaty to know what they are. Just knowing names is not enough.
In general, people say confederations have less central powers than federations, however this is not without exceptions, and is subjective anyway.
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