Can I cross-swap every drive in two Mac Pros?

I have a 4 core and an 8 core MacPro, each with 4 hard drives (and boot camp, Windows on each system) - right now the more powerful machine is doing my less demanding work - so I'd like to switch the workspaces between the machines.
I might think I could just power each down, pull and swap all the hard drives - so now my 8 core has the 4 drives and workspace that used to be on the 4 core, and vice versa -- and then reboot -- voila --- BUT I'm hesitant to do it, as I might be missing some risk.
Anyone that could give me more facts on the feasibility (or not) in doing that?
Thanks for any help,
Dave

Sorry I left out some detail in my original post -- both machines were 2.8 GHz -- the 4 core was a late 2007 (Aug) and the 8 core a very early 2008.
I did the 'all drives' swap and everything worked quite nicely. On one machine (now the 8 core) I had OSX 10.5+ , Vista 32 (Home Premium) and Vista 64. (both using Boot Camp). The Vistas all looked around for the right drivers and, after a restart or two (as required by the drivers - no crashes) everybody was happy.
The mac on both those systems came up just fine, too.
Now - I've just started using NTFS on all the windows drives/partitions and NTFS-3 on OSX to read AND write everywhere -- things are verrrrry nice.
I love the way the Mac has made 'occasional needs for Windows' so workable.
Thanks,
Dave H

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