How macros/functions are handled when they exists multiple times in different libraries?

Hi,

question is in the title.

I have made different libraries and implemented the same macros/functions. When i search in the Graph there is only one selection of the macro/function.

Why i am doing that?

I develop different standalone Projects, but they can be put together. So some macros/functions will exist multiple times.

Thanks in advance

Would it matter as long as they are the same?