They are not identical; for example the MSI has alc 892; while the asrock as alc 1150 for sound; the MSI board also lacks display port (important for high resolution monitors).
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The msi board does have pci slots (important if you have an old pci device that cannot be replaced via pcie (I have this issue).
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The extreme6 has 10 sata ports (if you need extra sata ports). There are a few other differences between these systems.
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I'm personally going to go with the extreme6 since we have a local micro-center and the bundle is a good deal; just have to find a work aroudn for lack of pci slot first.