ssh regenerated moduli file much smaller than the one provided by Debian

[Daniel]

I have followed the instructions under "MODULI GENERATION" in the "ssh-keygen" 
man page.
The resulting "moduli-2048" file is considerably smaller than the one provided 
with the
"openssh-client" package. I have a few questions around this:

 1) Why is the resulting "moduli-2048" file so much smaller?
 2) How is the original "moduli" generated in Debian 8?
 3) Why is the "moduli" file provided by the openssh _client_
    package ("openssh-client")? I would have thought that
    this file is important when generating the server keys
    as well?

Thanks for your time
- Daniel