The senate and house versions are supposed to be exactly the same. They are 940 and 870 pages respectively. I have no idea what accounts for the 70 page differnce.
The senate did pass one amenedment re: AI to the version presented to them. It is not likely to account for the 70 page differnce.
There is a sumary here of the May 22, 2025 version the House sent to the Senate
https://www.congress.gov/bill/119th-congress/house-bill/1
70 pages of *All work and no play make Jack a very dull boy”