Lew,
I talked w/ the Webasto HG in Michigan. As long as you have 12v going to the control box the same control box is used on models 2020 and 2010.
They did say becareful in removing the plug from the box. Movement of plug should be side to side not front to back, as it will damage the solder connections.
I'll be glad to send you my control box to try -- just make sure it's 12v.
Mike