/SQL/IS THEre any difference between using default and := in plsql

IS THEre any difference between using default and := in plsql

DECLARE
    blood_type CHAR DEFAULT 'O';         -- Same as blood_type CHAR := 'O';
    hours_worked    INTEGER DEFAULT 40;  -- Typical value
    employee_count  INTEGER := 0;        -- No typical value

  BEGIN
    NULL;
  END;
  /

Source: stackoverflow.com

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