heya

soooo it gets confusing to some people to explain because people just seem to define "new" or "extended" differently. i've tried to play with the wording to attempt to take that ambiguity out but it seems like it's always there so I sorta just roll with it now.
But, the longer answer is that the Revamp has extra dialogue sometimes and certainly has thousands of more images. The added CGs are more detailed and environments in the game (like the cafeteria, pool, gym, etc) have more students there (which ironically did require that i eliminate the joke in the original game when they talked some sometimes feeling like they were the only students at the school

). in my own opinion, i'd describe it like taking some old film and reshooting it as a 4k director's cut. The writing is much smoother which required some lines to be eliminated or combined. some events may take place in a slightly different location or different backdrop (like a scene in the newest update takes place in the park whereas it took place just generally outside at night in the original because that outside backdrop was terrible). however, the story doesn't change. the story is not perfect but i was adamant about keeping things there-- even the flaws-- because i don't want to just go back and retcon shit because that's really annoying to me as a reader. but the story should feel more polished. There's frequently extra dialogue or jokes or maybe a tad of backstory on something (although backstory is always limited on purpose). There's also very frequently new poses/expressions for the characters which should translate into giving them more personality and just generally adds a lot of life to the characters that was missing before. some readers have reported more humor in the revamp although I didn't actually include that much more-- but maybe I'm just in a different headspace
The revamp also has a fully licensed soundtrack and sound effects as well as more animations. i do the animations by hand and i'm still learning so they're certainly not perfect but i'm getting better and refuse to use AI for anything
I think the last major change to the revamp from the original takes place within the first 3 chapters where the frequently frustrating "loops" were removed and the story is more linear now. you no longer have to try and figure out what you haven't picked to move the story forward.
lemme know if that helps or if you have more follow-up questions, that's perfectly fine too