No, the data in different locations does not need to be the same (think: quorum operations).
Consistent means that they are consistent from the perspective of the client within the rules of the consistency model. If you have sequential consistency and quorum operations, your replicas do not need to have the same data, but the view of your clients is always consistent.
Consistent means that they are consistent from the perspective of the client within the rules of the consistency model. If you have sequential consistency and quorum operations, your replicas do not need to have the same data, but the view of your clients is always consistent.