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It will look identical assuming the 262k colors monitor reduces the gammut using the same method used for that image.

Thank you, as this puts paid to anyone here saying there's no visible difference except to pixel peepers.

(Well, assuming one is comparing on a true 8 bit screen.)

Please note that the 6-bit image is not what will be present on an Apple screen. The difference between 8-bit and dithered 6-bit is difficult to notice for most people.

Is there a way to test if you have a 6 bit monitor?

Easiest way: Look up the monitor's serial number online, and see if it's 6- or 8-bit.