Unfortunately, that's not an option.
I should probably have specified that this installation is the original Solaris 10 release. I have applied a pretty recent '10 Recommended' patch cluster to the system. Prior to this, it had never been patched at all.
I've needed to add a couple of packages from the orginal Solaris 10 packages since for various reasons and I need to identify the patches that would be applied from the patch cluster to update those components.