Keep custom fix in a plugin

I have a plugin that needs a (very) custom feature, for a site I’m making.
I’ve found it in the code, where I can remove some lines of code, so the feature is accessible as I would like. But I’m not sure how to maintain this custom fix in the future.

add_meta_box (Will display only in specific page admin WordPress)

I am wondering how to add meta box in WordPress specific page admin, I mean when I create meta_box with code snippet below provided from source tutorial is really perfect and effective but one thing that I need to control is display that meta_box only in specific page for instance: pretend I have two page in my WordPress project named Home and About.