Install XP from one CD but activate with license key from another?

[Guest]

I've just helped a friend recover from a disaster involving the HDD on his
notebook PC. It had Win-XP-Home pre-installed but he can no longer find his
recovery CD. I've asked him to buy a new retail copy of
Win-XP-Pro-Academic-Upgrade but am not waiting for him to do this before
installing Win-XP-Pro-Academic-Upgrade from the same media that his Desktop
PC used. I have not attempted to activate this second installation.

I have read that you may purchase additional license keys to use with the
one OS installation media. That may be an option, also.

My question:
Can I install from one Win-XP-Professional-Upgrade-Academic CD and then
later activate using the license key from a newly purchased
Win-XP-Professional-Upgrade-Academic product?

I know from experience that I can't activate an XP-Pro installation using an
XP-Pro-Home license key, so I wonder if I also need to be careful about
whether the 2nd product license key is for
a) Academic or Regular?
b) Upgrade or Full?

 

[DL]

I believe that if you install from a win cd that is the *exact same version*
as that previously installed, then the key on the case will be OK