A MB for a desktop has features usually. Those features tend to include a common cpu type, chipsets for access to audio, video and memory access. They also include access to the back plane.
A network switch is a single purpose device. It has been built to move data. It doesn't support audio, video. You usually can't add or remove memory. You won't have a standard processor. The way the nic's attach to the back plane of a switch is designed to allow maximum traffic between nics or vlans.
It really is like comparing apples to oranges.
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