WildMagusI'm guessing one is a re-branding of the other. They list the exact same specifications and look identical if you remove any printing. If you want to check for yourself look up 600800 on Monoprice and look at the specifications and compare them to the specifications from the Amazon listing.
WildMagusI would bet that it is absolutely the same mic. Monoprice purchases many items from OEM Manufacturers in China that are being sold in the US for higher prices under different brand names.
For example, this is an enlightening/controversial review of a Monoprice home theater speaker system that bore a striking similarity to a popular Energy home theater system: http://www.cnet.com/products/monoprice-9774/