A list of changes? Well, there's quite a bit of them, but nothing major. They're mostly slight changes to the dialogue in order to make them sound more natural and a few quirks here and there to keep the series a bit more interesting.
For example, Sally is a princess and was most likely taught to act like one, so whenever she talks, she speaks delicately with a few big words thrown in to show off her knowledge. Sonic, on the other hand, his a speed-talking prankster due to his addiction to speed, so his hipster dialogue is full of quick, abbreviated/contracted words and cheesy one-liners. I also made Antoine sputter a few miss-attempts at speaking English and gave Snively's persona a hint of a snooty British gentleman (inspired by Rowan Atkinson's performance in "Black Adder").
As for major changes, there's only a few, but nothing drastically different:
* Most the battle scenes were shortened and/or removed entirely because they went on for too long and became kinda repetitive after a while. There's still plenty of action scenes though and some of the removed parts were reused for later scenes.
* I moved the scene between Bunnie and Antoine to after the meeting when Sonic and Sally return from the shelter. I felt its placement in the original chapter kinda broke the story's pacing.
* I also added two scenes featuring Farrell and Lady Windimire giving pep-talks to Sonia and Manic before they leave. I felt like there should've been more emphasis on their relationships and their eagerness to move on with their lives. And later on, I added a bit were Snively briefly interrogates their foster parents before they're roboticized, in which he discovers their relation to Sonic.
* I also added back the scene in the beginning with Scratch, Grounder, and Coconuts cleaning the prison since I felt their introduction in the revised chapter was kinda sudden and unexplained.
* I also added a few more cameos in the shelter scene, including Sgt. Doberman (who attempts to interrogate the captured Sonic and Sally before Cyrus steps in) and "Old Man Owl" from the OVA (who greets Sonic in the park and later joins the refugees at Knothole). Most of the other cameos are in the background and have nothing to do with the overall story.
Other than that, there isn't much else. It's still really faithful to your original source material.

