Hi ddreams, I see from your sig that you have 2 C.Paleatus and 4 C.Aeneus. If each have other members of their species, then they should just spawn inside the species boundaries. I have never seen cross species spawning, but have found several referances to it on the nternet. Hope this helps!
I doubt that you have anything to worry about. The chances of any corys interbreeding are slim. Beside, when the time comes to actually let them spawn, you will probably want to move them to a small tank by themselves. That way, you can remove the adults and leave the eggs to hatch and the fry be raised there.
Here's a link you might find interesting. If you scroll down, you will find a post where I describe the kind of equipment I use for spawning and raising the fry.