A method includes identifying at a first instantiation of a device design and a second instantiation of the device design, determining a first value of an electrical performance characteristic of the first instantiation and a second value of the electrical performance characteristic of the second instantiation, determining that the first instantiation matches the second instantiation, wherein the determining is based on the first value, the second value, and a tolerance, and in response to determining that the first and second instantiations do not match, then identifying a first feature of the first instantiation and changing the first feature of the first instantiation.