How interchangeable are slot loading logic boards

A friend has a 400Mhz slot loader that is working fine and is in the process of getting a 600Mhz snow iMac with a powersupply problem. Is it possible to just swap the logic boards? They are going to have me do the swap so I need to know some stuff going in:
Any voltage issues I should know about? I assume they are similar in shape but does one draw a different amount of power I'd need to deal with?
Do the ports line up with the case in the same way and shape on both logic boards?
And the VRAM is mounted on the logic board too right? So the 16Mb on the 600Mhz iMac travels with it on the logic board, correct?

Langdon,
Any voltage issues I should know about?
The dangerous voltages are on the board in the top of the case (the brown one, PAV) and you'd have to stick a wet finger or metal probe through holes near the bottom to reach anything dangerous. That would also be with the machine plugged in and turned on.
I assume they are similar in shape
They are identical and the mounting screws and snap tabs are identical
but does one draw a different amount of power I'd need to deal with?
AFAIK they're identical. The power derives from the down converter and you'll move that with the logic board. The down comverter plugs into the logic board. It's the little sub board off to the side that has coils, capacitors and transformer looking thingies on it.
Do the ports line up with the case in the same way and shape on both logic boards?
They're identical.
And the VRAM is mounted on the logic board too right? So the 16Mb on the 600Mhz iMac travels with it on the logic board, correct?
Right it's hard to tell the difference without close inspection.
Richard

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    Revision: 14580
    Revision: 14580
    Author:   [email protected]
    Date:     2010-03-04 09:28:35 -0800 (Thu, 04 Mar 2010)
    Log Message:
    Commit example showing how to perform additional load logic via a ProxyElement.  The AsynchLoadingProxyElement (and its corresponding LoadTrait) load the proxied element, but doesn't expose its READY state to the outside world until it performs its own load operation (in this case it just runs a Timer).  Include minor fix to other example.
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        osmf/trunk/apps/samples/framework/ExamplePlayer/org/osmf/examples/loaderproxy/AsynchLoadi ngProxyLoadTrait.as

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