Data replication from UrBackup Server to another server shows very high data size


We are using UrBackup server version 2.0.38 on CentOS 7 with ZFS pools.
What we want to achieve is,

Take Backup of clients using UrBackup
Once Backup is completed, need to replicate the data to another server over WAN using ZFS send and receive (using snapshots).

The issue what we are facing is urbackup shows 2GB data change (INC backup) but when we do the replication using ZFS send it shows 5GB data size.

Let me know how to go about the configuration such that my data size matches with respect to UrBackup and Replication.

Thanks in advance.