According to pinwiki, you can:
https://www.pinwiki.com/wiki/index.php?title=Williams_System_9_-_11#Sound_Boards
The only issue may be the ROM chips used in the boards. The Comet board is one of the later boards that can be setup for 2732 ROM chips. If you are using the later board in the BK, you will need move the jumps over to set it up for 2532 rom chips.