rc6-git8 Makefile from cg-export and bz2 patch don't agree

I wanted to get a clean 2.6.12-rc6-git8 tree, so I looked up the commit
id (3edea4833a1efcd43e1dff082bc8001fdfe74b34) at
<http://kernel.org/pub/linux/kernel/v2.6/snapshots/>, updated my .git
repository with

rsync -a --delete --verbose --stats --progress \
   rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git/ \
   .git/

then did 
  cg-export /tmp/xyz <commit-id>

Strangely, the Makefile doesn't match what I would get by applying
patch-2.6.13-rc6-git8.bz2.  In the exported Makefile,

EXTRAVERSION =-rc6

whereas from the patch, Makefile (line 151 of the diff) has 

EXTRAVERSION = -rc6-git8

Was this a case of hand-editing the diff or did I not use the cg/git
commands correctly?

-Sanjoy

`A society of sheep must in time beget a government of wolves.'
   - Bertrand de Jouvenal