Are the DST patches just Registry entries?

In KB914387 Microsoft gives you the registry keys that need to be changed
for W2K. Are the patches for XP and 2003 just the same registry entries in a
patch file or is there something more to it?

I am in the EST time zone and when I applied the XP patch to my computer I
saw that my EST reg entries were the same as my 2003 server and 2000
workstations that I patched so far. If these patches are just registry
entries I can and would much rather use the FREE utility from
DesktopStandards callled PolicyMaker Registry Extensions to import the
registry keys automatically via Group Policies. I could just make this a
domain policy and never have to worry about patching a computer in the
future.