We can confirm that payload is the difference between the maximum permissible weight and the kerb weight (the actual weight of the vehicle). There are differences in features and equipment between the different grades, which means that the Advance version weighs more than the Sport version, which in turn weighs more than the Elegance version.
For example, according to specifications, the Sport version weighs 1459 kg, while the maximum permissible weight is 1930 kg, so the payload is 471 kg, which is the difference between the values mentioned above. The same applies to the other grades.
All grades of the Civic Hybrid have the same suspension. The rear suspension is Multi-link and the front suspension is MacPherson.