As far as I can remember , Steve, they all came from the same version of the Dataset.
But it has me thinking, as the original AECOsim GB dataset had rules that referenced the old BA, SM Families/Parts. The update 1 GB dataset had rules that 'linked' to the correct part definitions. So, most 'old' dataset rules files had to be re-built to the correct Family / Part definitions so they could work. I really think I only noticed this 'reducing' rules files once we got to the update 1 versions.
John Davis