I’m not sure why there was only a 30 digit difference. Maybe a digit was accidentally missed?
The unofficial world record is over 100,000 digits.
If you haven’t seen it yet, you might be interested in this video: First video: Remembering and locating a chain of 20 decimals of Pi, within the first 25,000 and reciting the next 100 decimal. Second video: Making a triple sudoku, number + color, blindfolded