GE Profile Oven Replacement of oven control

Replacing electronic control unit WB27K5302 on this oven. The WB27K5302 part is not made any more and I am to use WB27T10207 which has the black box and another part. Has anyone Swapped this out?
what is the other part in the kit for. Can I install myself? Help? When I go to order the part the comment comes up …may need technician.