Question about adding a new global list vs updating an existing one

Hello Experts,

 

I have a quick question to ask. If I need to update a global list with all new values but I have old records with the previous values.

What would be the best option to take when doing this?

Should I create a new Global list with all of the new information?

Is there a way to add information to the old global list but only disply the new items added?

Need your help?

Thank you in advance.