CPU-Upgrades: can Sonnet and PowerLogix Firmware live next to each other?

Hi,
I have previously installed a Sonnet firmware with a Dual 1,8GHz 7447. This also worked with a Single 1,2GHz 7455 Sonnet, no reflashing.
Now I got a PowerLogix/Newertech 7448 Single 2GHz and I am asking myself, if I first have to uninstall the Sonnet firmware or if both can "live" on the same ROM-Chip?
I would like to be able, to once swap the CPUs again and so prefer to not uninstall the FW. The PowerLogix Manual is very specific, but it does not say something about whether you have to first uninstall other firmware.
Thanks!

So, I guess I have to first uninstall the Sonnet FW (there is an uninstaller!). The Apple Firmware should be the normal 4.2.8 then again, right?
I remember some time ago I read on hintsforum.macworld dot com that MDDs were different. If you installed a sonnet FW, you could not use the stock CPU afterwards again, because the ROM was deleted. Explanation was, that there wasn't enough space on the chip.
I will have a look, if I can contact PowerLogix or is there site only for past reference (like archived)?
I'll find out. maybe OWC can help me out, too.
I come back and tell you all. If someone likes to add something, please feel free to do so!

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