Yes.

The CC and 550 are totally interchangeable. In fact my CC board was still in a 550, working hard in a 3rd grade classroom, last time I saw it.

I think the CC and the 520 are the same board with resistors to change the Gestalt ID (i could be wrong). The CC, 520, CCII, and 550 were all basically the same machine with different CRT sizes. The analog boards are even incredibly similar.