Whoa...confirmed, Captain
Canned Google search, 7 hits. I'll be damned. I skimmed some of the references, and the Kzin connection isn't really spelled out, they just appear in anecdotal battle stories. Sounds like a fan who liked both universes couldn't resist punching a hole between them.
There's a disclaimer on the front page:
The SF Museum presents a fan fiction that does not necessarily comply with events shown on screen, especially not with the most recent series, Enterprise.
No kidding.