I had a component named "Button"

I made some drastic changes to it not realizing that it was used a lot throughout our designs, and my changes will probably affect the existing designs 

Didn't publish any changes to the library yet

So I renamed the component to "Button new", and copy pasted the old unchanged version of that component from the version history, called "Button"

Now if I publish the changes, will it break all my instances of "Button", or will they remain intact and I will simply have a new component of "Button new?