Sounds like what you're talking about is what's called a "linked-on-or-after" check. That's where they'll see what version of the SDK an app was built against,

Sounds like what you're talking about is what's called a "linked-on-or-after" check. That's where they'll see what version of the SDK an app was built against, and enable or disable specific features or bugfixes. Obviously that could be used in conjunction with your app's bundle id.