Question about ethernet addresses

Hoping one of you sharp IT guys can answer a question about ethernet
addresses on my Mac. So far, I seem to be coming up with two different
addresses for a single machine, and I wonder which one is lying to me.

Running System Profiler yields the following for my G5's MAC address
under ethernet settings:
00:18:24:2a:b3:f4

Opening the Network pane of my System Preferences gives me a completely
different ethernet address:
00:0a:93:45:b1:14

(The two examples above have been munged in case hackers find these
addresses useful, but the differences are more or less as written.)

My understanding is that the ethernet address is a unique identifier
for my network card. If that's the case, why are two different system
tools reporting two different addresses, and which one is accurate?

-Frank

--
Here's some of my work:
http://www.franksknives.com
.

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