If both machine are running tiger, then it will not make a difference. Each machine can be updated to the latest OS X update.
If you want to try and use the new restore discs in the old macbook:
A. Put disc one in and hit restart.
B. While laptop is rebooting, hold "C" key down to boot from CD.
C. load the OS X
D. it may or may not take the new disc. It will tell you if it will not work.
Since you have not given much info, this is all I can guess on for now.