Do you NEED to keep the older version?
The path's for executables will presumably be
set somewhere in /etc (if it's the paths, not symlinks).
The python shared libraries should be listed
But then this all may be quite distro specific.
To find out whether python gets called through
a link, do both of these:
which python (will show you the path to the file)
ls -l `which python` (will show whether it's an executable or a symlink to an executable)