home button assembly in wifi & wifi + cellular different?

Hello. For the iPad Air 2, the home button assemblies are going to be the same. They do not use different home button between the models. You can use a home button from a different device or a new part. Keep in mind that the Touch ID function is not going to work at all. Apple makes it so new buttons cannot be reprogrammed. The click feature will work with no issues. Be very careful removing and installing these components are they are very easily damaged.