Leopard Reinstall - Which disc?

I have 2 aluminum iMacs with Leopard on them. I need to reinstall Leopard on one of the machines.

The problem is that I don't know which set of discs go to which iMac. They are the same machine, spec wise. Is there anything that would prevent me from just using either one of the set of discs? What I mean is do the discs have some information, such as a serial number, that link them to only the particular iMac that they came with, or would either one of the sets work?

I guess I probably should have labeled which set went to which iMac.

You say they are exactly the same machine? If so either DVD should work.

Yes, both are 20" iMac C2D (the new aluminum ones), same specs.

I just didn't know if the DVD looked for the machines serial number to see if it was the same machine the discs came with.

It's nice to see some one here from back when I was a more frequent visitor to the site, you're still as helpful as ever dtravis!