is it possible to replicate only a partition ?

If you're not already using copy_partitions_to_table, I recommend it. This should copy only the records from the specified partition(s).

You can use copy_partitions_to_table on the source database to create a table with the partitions you want to replicate. That operation is relatively quick. It is a metadata only copy, the storage is reference counted, not copied. Then replicate the newly created table to the target database and, finally, use move_partitions_to_table to transfer those partitions to the target table.

Thank you!
I already tested. It seems it copies only the modifications