Yeah, what the hell is up with the "nay" response.
It works fine. They're exactly identical. There are no serial numbers, no CD keys, no hardware checks.
The only problem is if you have a PowerPC model, you can't use the Intel discs and vice versa; failing that you're golden.
Edit - to clarify 100%. Your Macbook Discs will work PERFECTLY in your Macbook Pro because they are the same discs, if you bought them with a MBP or a MB. The discs have no check of which computer is using them.
You shouldn't, but if you felt inclined you could very well use the discs on all your friends intel Macs as well.