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I'm not certain if you're question is pertaining to local code or size, but either way in regards to size the nest is a little bit bigger then any Kidde I've run into by at least 1" circumference. Local codes, ALWAYS check with your local municipality before installing any electric stuff or safety gadgets, it's a pain to do anything twice let alone the issues that potentially arise when talking safety concerns.
Sorry, there was a problem. Please try again later.Not a pro here, but i would expect that they could be in the same locations. But check the guidance for Nest based on ceiling vs wall, etc. You will not need the red wire the links the detectors because these connect wirelessly, but these come with an easy adapter to tap into the power wires.
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