It's unlikely that Mustang wheels will fit a Camaro without modification, even if they appear to be similar in size. While both are American muscle cars, the bolt patterns (number of lug nuts and their spacing), center bore (the hole in the center of the wheel), and wheel offset (how far the wheel mounts in or out from the hub) are different between Mustang and Camaro models across different years.
You'd need to check the specifications of both the Mustang wheels *and* the Camaro's wheel specifications to confirm compatibility. Even if the bolt patterns match, differences in offset or center bore could prevent them from fitting properly or safely. Using wheels with an incorrect offset can affect handling, braking, and potentially cause damage to your car.