You could try going the upgrade route. If that will produce a new initrd file that you need, you might be OK. Since the motherboard will have different hardware, different modules would need to be loaded. That means the initrd 'ram-drive' will need different drivers and a different script, and the /etc/modules.conf will need to be replaced. I'm not absolutely certain it will work, but the 'upgrade' option would perform this normally anyway because the driver versions would be changing if you were going up a version number for instance. Also, the /usr/local hierarchy shouldn't be touched by an upgrade. However, programs that you installed from tarballs may be need to be reinstalled.
( I'm assuming that you are not changing architecture, such as going from 32 to 64 bit processor ).
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