Different responses to description request between Mac and Linux

I am working on extending a library for RobotFramework and added a
keyword for column description retrieval but noticed that when I run it
on Mac OS X 10.6 I am getting:
Column(name='id', type_code=20, display_size=None, internal_size=8,
precision=None, scale=None, null_ok=None)
but when I run the exact same test against the exact same database from
an Ubuntu 10.10 Linux box I am getting:
('id', 20, None, 8, None, None, None)

The only difference that I can find is that the Mac box is running
psycopg2 2.4 installed via (python setup.py install) while the Ubuntu
box is running psycopg2 2.2.1 installed via package management.  Is it
possible that this version difference is what is accounting for the
response difference?

Thanks,
jer

--
Jerry Schneider
QA Manager
iPlant Collaborative
BIO5 Research Institute
University of Arizona
Linux registered user #475536
Ubuntu registered user #28583