trag covered this quite nicely in a thread I can't recall... I'll post it here if I find it.
The long and short is that only Power Computing daughter cards can be used, due to some differences between theirs and Apple's CPU cards. I don't know if it would brick it, but I don't think it's a good idea.
The PowerCenter (and Pro) are the same design as the PowerTower I have, which is to say it's a reference design of the Power Macintosh 7200 / Catalyst design. Just, PCC made it better
I used a couple of different PCC 604 CPU cards and even tried a 604e/225 out of (probably) a PowerTower Pro, and it gave me weird artefacts (like failing an FPU test but still stable). I eventually found a 604e/210 card which was used in the PowerCenter Pro* and it runs like a champ in my PowerTower. In fact, the boards are almost all (save the PowerCenter Pro) screen-printed with PowerCurve on them.
I like this database of *configurations Power Computing had:
http://macinfo.de/rechner/clone-powercomputing.html
Here's the section about the architecture:
http://macinfo.de/hardware/boards-g2.html#catalyst
EDIT: found it
Or was it this one?