Apple IIc Main Logic Board P/N

[Mark Coppey <mark.coppey@gmail.com>]

I want to swap my IIC main logic board/motherboard from the UniDisk
3.5 motherboard towards a real memory expansion motherboard, as to use
Apple's Iic memory expansion board. Is it correct that this is the
serial nummer of the memory expansion main logic board: APPLE
820-0180C I found one on a French site and there they gave this number
APPLE 820-0180A.
The board I own now is defective and has the number 820-0115C.