Yes and here is the reason. If you need to do a repair install of XP and you
attempt to use a "previous" version of the software, the repair install will
fail as you are attempting to install an older version of the software on
top of a newer version. You would have to uninstall the newer SPs (back to
the CD you are using for the repair install) and this may not be possible
with a "crashed" OS.
Don't throw away the original CD though.