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You can make different sized bikes end up at the same contact point geo by swapping stems, etc. like you suggest. I've used a 55cm Kinesis, 57cm Kinesis and now back to 55.5cm Kinesis all with the same contact points (when I get that stem). If you compared them side by side you'd notice some steering differences but you adapt after a couple of hours and can't tell any more, unless you start pushing the extremes (ie. 70mm stem I had to run because I bought the wrong frame size once) .
hippy
@paulbiche
Will certainly appear as a highly stupid question but let's say if the bike that fits you (talking about a classic horizontal tube, not slopping nor lo pro bike) is for example 54x56, with a 100mm stem ; what would prevent one to use a 55x57 (or 56x57 or 57x57) with a 90mm stem or a 53x55 (or a 54x55 or a 55x55) with a 110mm stem?
Does the bike overall geometry change with top tube/seat tube size (in terms of angles, etc.)?
I guess it is a stupid question since when you compare two different frames they might have different tube angles etc but I guess there are some standards in terms of bike geometries maybe