It's not a significant enough difference, IMO. It's just a few grams difference.
Bear in mind the ergonomics. Supposing you're talking about the Kindle touch, despite it being lighter, your wrist will be stiffer holding it because you'll need to move your thumb to tap/swipe to change page, as opposed to just keeping your thumb stationary on the page turn button the K3 and just applying little pressure intermittently.
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