I have a suspicion that the version might be different. I have the same symptom here on two different RH 7.3 boxes one running 7.3.2 and the other running 7.3.3
It would appear 7.3.2 is more strict about the naming of the GROUP BY fields.
They really are the same versions. For the OS X machine I installed from source downloaded from the postgresql ftp site. FreeBSD was installed from the port but my ports tree is up to date.
On freebsd:
501 $ pg_ctl --version pg_ctl (PostgreSQL) 7.3.3
On OS X:
516 $ pg_ctl --version pg_ctl (PostgreSQL) 7.3.3
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