Customer Questions and Answers for Refrigerator Defrost Control Board by Whirlpool

Hello Rudetemp, The exact differences are only known by the engineers who designed them. Since they are not interchangeable as they are not listed for any of the same models, they will have to have different defrost characteristics, especially since one is listed for larger cubic foot displacement units. This means that the duration between defrost cycles and the length of the defrost cycles have to be different because of the difference between the sizes of the units they are designed for. These type questions are best asked to the manufacturer who designed them. They are not interchangeable.