I mean.....
.....sometimes I would like for the first chapter to just magically be the same skill level I'm at now, but the idea of going back and redrawing all that..... pass!! I'm very much on team Once It's Done It's Done And I Ain't Fixin' It.
The thing I ask people is this -- how long has it been since those first pages? A year? Two years?
So if you did go back and redraw them, what are you gonna do in two more years when they look horrible again? Are you gonna redraw them again? And again? Every time they look horrible?
Basically, if you have the time and have a good reason why, like "I'm printing the book" or "the first five pages are the wrong size" or some tangible thing that will be fixed after one go, something that's NOT just "I'm itching to redraw because they look bad," then go ahead, but otherwise,

....it's normal for art to evolve, and everyone expects it --- don't worry about it. : )
@WhatAHero for the record, from an outside perspective the difference honestly isn't jarring! Like, when I'm looking, it's visible, but if I were just reading through the comic I wouldn't be like "WHOA WHAT'S THIS NEW STYLE"??? -- at most, maybe 5 or so pages into the shift, I might be like "hang on, is the art different?" But the characters and the way they're portrayed don't feel vastly altered, it's mostly the rendering that's different, so I don't think it feels like a really jarring change to a reader!