They are different:

cacraft-MOBL disper # grep ^__version__ /usr/lib64/python2.5/ctypes/__init__.py
__version__ = "1.0.3"
cacraft-MOBL disper # strings /usr/lib64/python2.5/site-packages/_ctypes.so | grep 1\.\0\.
1.0.2


cacraft-MOBL disper # python -v -c 'import ctypes'
# installing zipimport hook
import zipimport # builtin
# installed zipimport hook
# /usr/lib64/python2.5/site.pyc matches /usr/lib64/python2.5/site.py
import site # precompiled from /usr/lib64/python2.5/site.pyc
# /usr/lib64/python2.5/os.pyc matches /usr/lib64/python2.5/os.py
import os # precompiled from /usr/lib64/python2.5/os.pyc
import errno # builtin
import posix # builtin
# /usr/lib64/python2.5/posixpath.pyc matches /usr/lib64/python2.5/posixpath.py
import posixpath # precompiled from /usr/lib64/python2.5/posixpath.pyc
# /usr/lib64/python2.5/stat.pyc matches /usr/lib64/python2.5/stat.py
import stat # precompiled from /usr/lib64/python2.5/stat.pyc
# /usr/lib64/python2.5/UserDict.pyc matches /usr/lib64/python2.5/UserDict.py
import UserDict # precompiled from /usr/lib64/python2.5/UserDict.pyc
# /usr/lib64/python2.5/copy_reg.pyc matches /usr/lib64/python2.5/copy_reg.py
import copy_reg # precompiled from /usr/lib64/python2.5/copy_reg.pyc
# /usr/lib64/python2.5/types.pyc matches /usr/lib64/python2.5/types.py
import types # precompiled from /usr/lib64/python2.5/types.pyc
import _types # builtin
# /usr/lib64/python2.5/warnings.pyc matches /usr/lib64/python2.5/warnings.py
import warnings # precompiled from /usr/lib64/python2.5/warnings.pyc
# /usr/lib64/python2.5/linecache.pyc matches /usr/lib64/python2.5/linecache.py
import linecache # precompiled from /usr/lib64/python2.5/linecache.pyc
import encodings # directory /usr/lib64/python2.5/encodings
# /usr/lib64/python2.5/encodings/__init__.pyc matches /usr/lib64/python2.5/encodings/__init__.py
import encodings # precompiled from /usr/lib64/python2.5/encodings/__init__.pyc
# /usr/lib64/python2.5/codecs.pyc matches /usr/lib64/python2.5/codecs.py
import codecs # precompiled from /usr/lib64/python2.5/codecs.pyc
import _codecs # builtin
# /usr/lib64/python2.5/encodings/aliases.pyc matches /usr/lib64/python2.5/encodings/aliases.py
import encodings.aliases # precompiled from /usr/lib64/python2.5/encodings/aliases.pyc
# /usr/lib64/python2.5/encodings/utf_8.pyc matches /usr/lib64/python2.5/encodings/utf_8.py
import encodings.utf_8 # precompiled from /usr/lib64/python2.5/encodings/utf_8.pyc
Python 2.5.2 (r252:60911, Nov 25 2008, 10:20:37) 
[GCC Intel(R) C++ gcc 4.1 mode] on linux2
Type "help", "copyright", "credits" or "license" for more information.
import ctypes # directory /usr/lib64/python2.5/ctypes
# /usr/lib64/python2.5/ctypes/__init__.pyc matches /usr/lib64/python2.5/ctypes/__init__.py
import ctypes # precompiled from /usr/lib64/python2.5/ctypes/__init__.pyc
dlopen("/usr/lib64/python2.5/site-packages/_ctypes.so", 2);
import _ctypes # dynamically loaded from /usr/lib64/python2.5/site-packages/_ctypes.so
# /usr/lib64/python2.5/struct.pyc matches /usr/lib64/python2.5/struct.py
import struct # precompiled from /usr/lib64/python2.5/struct.pyc
dlopen("/usr/lib64/python2.5/lib-dynload/_struct.so", 2);
import _struct # dynamically loaded from /usr/lib64/python2.5/lib-dynload/_struct.so
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib64/python2.5/ctypes/__init__.py", line 20, in <module>
    raise Exception, ("Version number mismatch", __version__, _ctypes_version)
Exception: ('Version number mismatch', '1.0.3', '1.0.2')
# clear __builtin__._
# clear sys.path
# clear sys.argv
# clear sys.ps1
# clear sys.ps2
# clear sys.exitfunc
# clear sys.exc_type
# clear sys.exc_value
# clear sys.exc_traceback
# clear sys.last_type
# clear sys.last_value
# clear sys.last_traceback
# clear sys.path_hooks
# clear sys.path_importer_cache
# clear sys.meta_path
# restore sys.stdin
# restore sys.stdout
# restore sys.stderr
# cleanup __main__
# cleanup[1] site
# cleanup[1] encodings
# cleanup[1] _codecs
# cleanup[1] _struct
# cleanup[1] zipimport
# cleanup[1] warnings
# cleanup[1] encodings.utf_8
# cleanup[1] _ctypes
# cleanup[1] codecs
# cleanup[1] types
# cleanup[1] struct
# cleanup[1] _types
# cleanup[1] signal
# cleanup[1] linecache
# cleanup[1] posix
# cleanup[1] encodings.aliases
# cleanup[1] exceptions
# cleanup[2] copy_reg
# cleanup[2] posixpath
# cleanup[2] errno
# cleanup[2] os.path
# cleanup[2] stat
# cleanup[2] UserDict
# cleanup[2] os
# cleanup sys
# cleanup __builtin__
# cleanup ints: 7 unfreed ints in 1 out of 8 blocks
# cleanup floats