HDD PCB Boards

1. HDD printed circuit board (PCB) replacement – Hello,I have two seagate HD with
CPB numbers: 100468979 K 700557XD and 100468979 J 7919M2WX
Can I use PCB from one to the other? will this bring risk to corrupt data?

2. hard drive recovery/pcb question – Was working on my pc, which has mirrored 250gb drives. PC Locked up and heard light clicking. This had happened once before, it was the power cable loose on the sata drives. I touched the cable, pc remained locked…. seemed like it powered up for a sec but nothing happened.
Powered off pc, both drives unrecognized by system. Which is odd for a mirror, but it must have gotten a power surge. One of the mirrored drives clicks on boot (not clack-clack-clack like a crashed head) but more like spin up, click, spin up, click… like it can’t find where to start. the other drive gets no power at all.
Have done PCB replacement before with success and so decided to try again. Took pcb off drive that would not power up, moved to drive that clicked. Now the "clicking" drive would not power up. that means pcb is broke/burnt.. likely both are in that case..
moved pcb from "clicking" drive to the drive that wouldn’t power up. it clicked once, and i pulled power from the system.. likely that pcb dead then too.
The mirror worked not 15 seconds before the clicking began. It would be odd for both drives in a mirror to have simultaneous head crashes… so i’m thinking it’s the pcb.

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