The control group of medical device clinical trials must be the same model of equipment?

Depends on what kind of device you are doing clinical trials, such as dental implants, or bone grafting plate or whatever, will be based on different human body structure, different age, body type of patients have different models, so not necessarily the same model. However, if there is a fundamental difference in the function of the two models, it will have an impact on the rationality of the test data, in the trial design, it is necessary to set the use of the same model.