The 466 is a Digital Audio and can't use any other power supply because of the 28v ADC connection required. The DP 450 would be a Gig Ethernet which shares the power supply of the Digital Audio.

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The power supplies are different, because the DP 450 doesn't have the ADC power connector on the motherboard, therefore it wouldn't have the power lead for it.

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The Gig Ethernet does support ADC monitors. Only the Yikes! and Sawtooth do not. Since yours now turns out to be a single 400mhz and AGP and the power connector does not have the 28v pin, it has to be a Sawtooth motherboard mounted in a case labeled for a Gig Ethernet. Most likely someone pieced this Mac together from spare parts or the original case got damaged and was replaced. Here is the Gig Ethernet pinout from Apple.

http://docs.info.apple.com/article.html?artnum=95064

Note pin 22. +28v