Not entirely clear on what you mean, but here goes:
You CAN replicate between SEPARATE instances of MySQL Cluster in different geographic locations. This is definitely a known and supported setup.
You CANNOT have nodes belonging to the SAME MySQL Cluster in different geographic locations. Due to MySQL Cluster's architecture and connectivity requirements, this is not supported, and at least 99.9% guaranteed NOT to work. :)
Does that help answer your question?
For more information, please read
the first few sections of the MySQL Cluster chapter in the MySQL Manual, which provide an overview of MySQL Cluster architecture and requirements, as well as the section discussing
MySQL Cluster Replication.
Jon Stephens
MySQL Documentation Team @ Oracle
MySQL Dev Zone
MySQL Server Documentation
Oracle