Compare two builds and help to solve a problem

I have two builds of an enterprise iOS app. One earlier build, includes an additional menu item in a sliding drawer that has been disabled in the later build. The underlying code for the missing menu item exists, but it does not appear in the drawer. I'm looking for help to identify what between the builds causes this to be disabled, and if it's possible to renable the menu in the later build by updating a value or file.