Will using your Memory Module in my radio break my warranty?

No, it will not - this is coming from Futaba. On a side note, don't confuse the CAMPac slot in your radio with the frequency module port on the back. Using a frequency module that is not approved will not only break your warranty, but it's also against AMA rules and you are flying uninsured.

Will your 16K Memory Modules work in the Futaba 9Z series radios?

Sorry, the 9Z series radios can only take 64K (or 256K) modules.

Is there any difference between the Hansen Hobbies 16K Memory Module and the ones Futaba sells?

The 16K uses the same chip as Futaba's (a common EEPROM chip) and the only real difference is that Futaba's comes in a plastic case. The 64K and 256K modules have special microcontrollers for proper operation whereas Futaba uses a custom chip for their 64K. Functionally, there's absolutely no difference between Futaba's product and ours.