I created a component but didn’t do it for all my screens and now they all look different as a prototype and I don’t know how to edit them individually to look the same without starting over.
I think it will be better to “start over” in this case. But as a silver lining, it will be much quicker since you turned your screen into a component (and you are not completely starting from zero)!
As a suggestion, you can add variants to your component for the 4 states:
screen with blank input
screen with filled input
screen with blank input and error
screen with filled input and success
In this way, you can very quickly connect the screens into a prototype again.