A visit from Saturn: What if Saturn flew past the Earth

Saturn's rings were created using Voyager data and Cassini Data, and tables from the IAU, and nasa Interestingly enough, the voyager data and Cassini data did Not completely match each other, More interestingly the differences between the two data sets were not consistent along the ring, specifically the small Gaps along the rings are inconsistent between voyager and cassini. there are 3 conclusions i can reach from this,
1, the data is simply not perfectly accurate,
2, I interpreted the data incorrectly,
3, the Rings have actually changed a bit between voyager and cassini.