[CentOS] Latest x86_64 != latest i386 packages?

I have CentOS 4.3 on two machines, one i386 (3.0GHz P4) and one x86_64 (2.6GHz Opteron).

Both have centos-release-4-3.2 autoconf-2.59-5

However, on the i386: perl-5.8.5-34.RHEL4

Whereas on the x86_64: perl-5.8.5-24.RHEL4

Is this really correct?

I ask because when I attempt to recompile zsh on the x86_64 box, I unaccountably get this error:

Can't locate object method "path" via package "Request" at /usr/share/autoconf/Autom4te/C4che.pm line 69, <GEN1> line 111.

I'm trying to recompile zsh in the first place because the "limit" command doesn't work on the x86_64 system, so the SRPM build appears to have incorrectly preprocessed sys/resource.h and I wanted to track down the details before filing a bug report.