If you are really so interested in Kosher versus Kosher-style, read up.
Katz's sells a reuben, but I don't eat it so I could care less. I stick with a chicken caesar salad
or Meatball Express. I don't actually prefer eating there, but my love loves it.
I don't believe they serve anything close to a Cuban. No pork. Even the bacon at Katz's is beef.