Difference between K8400VERTEXMAINBOARD and K8200MAINBOARD

Due to a major breakdown on my K8200-mainboard it is beyond repair. From earlier fixings on my K8400VERTEX i’ve got a spare Mainboard: are these interchangeable? In other words, does an K8400VERTEX mainboard work on a K8200? And which firmware do i have to upload? Woud the original K8200-firmware fix the job? As i could find the schematics of both boards they look similiar to me, so it should work, right? For the bedheater i can use a MOSFET, so that wouldn’t be a problem either…