Even when .live() function is removed after 1.9, I am seeing it being used in multiple places in my application and it is working also with version 1.11.2

Now, when I am upgrading it to 3.3.1, the behavior that I have seen is that .live() works in some pages while it gives error in some other pages and needs to be replaced with .on()

So, my question is:

 "Do I need to change every occurrence of .live to .on when I am upgrading to 3.3.1 even if .live works ?"