The data is not the same... the formats would be different. The older data worked with the older programs because the older data included ratings and the software code to support them. Since the newer data does not have ratings and has many more campgrounds than the older version, I wouldn't expect them to work together.
You can probably confirm this with a note to
support@undertowsoftware.com and ask them nicely. They'll probably reply with something like, "fuggedaboutit, they ain't the same". Give it a try and let us know what they say.
I like to use the automotive industry for analogies, but when a new car comes out, the old parts are not always compatible especially when the differences are extensive. RVPNG2013 and any prior version of RTN or TLDCN are different enough.