The partition sizes are the same because it is mounting the same partition for each.
If you have a different option for your df command you may be able to show the mount more (on Solaris df -k would show as below) OR if you have access to that system, do a command to show what it is exporting for nfs (Solaris: $ share HP: $ exports) - you should see that each is actually the same partition which is why each has the same information showing.
Your other question - check with that other admin - it's possible every thing you needed was already there but your PATH to find it was not. You may not need to install that package, just adjust your PATH.
pkginfo - read the man page for options - this is assuming SUN OS (which you posted in your Sendmail questions - helps to post OS and version in all questions)
You may also find software that doesn't load via pkgadd - most of these SHOULD be in /opt or /usr/local/. Where to put extra software is left up to the individual admin who may have their own way of doing things.