Well I'm of the opposite opinion. If they match closely in daylight then you can always play with the illumination (add filters in the back or the button, try different coloured LEDs, ...) to try and get the illuminated colour to match. Does someone who already has a set of buttons want to look at how well this works? Tony?
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)