[Distutils] Two versions of SQLAlchemy side-by-side?

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We have SQLAlchemy 0.3.3 installed via setuptools.  I upgraded to 0.4.5
today but had to back that out (by editing easy-install.pth) because of API
changes.  Now I have these two installs

    .../site-packages/SQLAlchemy-0.3.3-py2.4.egg
    .../site-packages/SQLAlchemy-0.4.5-py2.4.egg

Is there a way to import the 0.4.5 version for testing without disturbing
the 0.3.3 version?  I tried placing the 0.4.5 egg directory in PYTHONPATH
but I still get the 0.3.3 version when I "import sqlalchemy".

What's a fella to do?

Thanks,

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