Yeah, I think the most of the difference is the last 15 minutes or so which happen at a train station instead of the house with kidnapped Bronson's son, which in this version just doesn't exist.
FYI it's on Amazon Prime for free (well, free if you pay for Prime):
https://www.amazon.com/Payback-Directors-Cut-Mel-Gibson/dp/B0CQFYYMMS