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Reach and headtube length (a proxy for stack) give some idea of how long the front end of a bike will feel. With a short headtube/low stack, you end up losing effective reach with headset spacers. So if you have two bikes with the same listed reach but one has a longer headtube, that one will fit bigger.
I agree that two bikes that appear to be similar in size on paper can fit quite differently.
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