Different Version Numbers for Excel, Word,

Version: 2004
Operating System: Mac OS X 10.5 (Leopard)
Processor: Power PC

Today, I decided to make sure everything was up to date. I usually let
AutoUpdater do its thing so I was surprised to find that Word was
currently version 11.3.8. I downloaded the 11.3.9 update but when I tried
to install it, the only versions it found for updating were on my Time
Machine Backup drive. After restoring Office a couple of times, I've
discovered that I have in fact run all the updates properly (as shown in
the Updater Log), but that Excel is currently version 11.4.1, Word is
11.3.8 and PPT is 11.3.5. What's with that? Why would they not all be
11.4.1 since it appears to affect all of them? Should I be concerned?

Thanks for any advice!