kernel recompilation - just copy over?

["Monique Y. Herman" <spam@bounceswoosh.org>]

I've been running 2.4.21.  I had Debian's 2.4.21-5 and now see that
2.4.21-6 is available, with the fix that's been on everyone's mind.

Can I safely just copy a few files over from the previous build, or
might there be changes that would require a more careful procedure?  Can
I use `make oldconfig` when it's really still the same kernel version?

If it *is* as simple as copying over files, do I just need .config, or
is there more to the story?

-- 
monique