You did have a look at the help from the replication command "replication show stats all"? As using the all, shows information a bit differently as it mentions "Network bytes sent to destination" compared to when only using "replication show stats". The numbers from "Post-comp Bytes Sent" from the "replication show stats" are the same as the "Network bytes sent to destination" from the "replication show stats all" command.

SYNTAX
replication show stats [ | tenant-unit | all]

Display statistics for all replication pairs, a tenant unit, or a
specific destination pair. Output format is based on replication type. In
collection replication, the difference in values between Post-comp Bytes
Sent and Post-comp Bytes Received is expected behavior. Role required:
admin, limited-admin, security, user, backup-operator, none, tenant-user,
tenant-admin.

Output Definitions

Network bytes sent to destination
The number of physical bytes sent to the destination
over the wire.

Pre-compressed bytes written to source
The number of bytes received by the source, including
logical bytes associated with the file being replicated.

Pre-compressed bytes sent to destination
The number of bytes sent to the destination, including
logical bytes associated with the file being replicated.

Pre-compressed bytes remaining
For directory replication only, this is the sum of file
sizes remaining to be replicated for the context. Output
includes the entire logical size of the current file
being replicated. If a large file is being replicated,
this number may take a lot of time to change. The number
changes only after the current file finishes.

Compression ratio
The ratio of the value of logical bytes ingested to the
source to physical bytes actually sent to the
destination over the wire.

Sync'ed-as-of time
The time when the most recently replicated data on the
destination was generated on the source. A value of
Unknown appears during replication initialization.

Parent topic: replication