^^^ There is no difference really. If you have one, you dont need the other.
Btw, you saved the sp1, you didnt know that you can integrate sp1 into a copy of windows xp?
meaning, you can take your original xp disk, copy the files to your computer, take the sp1 service pack, and combine those files into the xp files you copied to your computer making your xp files windows xp with service pack1 and then burn those files to a image on a blank cdr , with the original boot image so it boots from when you turn on your computer as usual.
The ending result, is a Windows xp with service pack 1 cd.
When you install xp, the service patch files are all ready in the install.
if you want to know how
Do a search in google for integrating service pack 1 into windows xp.
if you need more help , pm me.
