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@nomoreknees
@chaliapin
How much seat post pokes out from the top of a horizontal top tube frame makes no difference.
The saddle is going to be at the same height relative to the pedals regardless that you are riding a 57ctt or 62ctt.
If both frames share the same seat tube angle ie 73 degress then the saddle will be at the same spot relative to the BB.
What wont be the same is the head tube height, IE on your 62cm frame it will be taller than your 57, so you probably wont be bending down as far and trying to raise your head to compensate (which would give anyone a sore neck)
@ the OP a critical, but often over looked measurement is top tube length,
and this is dependant on your torso to arm length ratio, and also how flexible you are and what type of riding you'll be doingr.
A shorter top tube length (all other things being equal) will generally give you a more upright stance more suited to everyday and longer rides.
Sadly there is not a lot you can do about this when buying a pre made frame as a shorter top tube will most likely be on a frame with a lower seat clamp.
Shortening a stem is not the same thing as riding a shorter bicycle, although reach will be reduced.