There will be a difference on the tubing- but the build of the frame can denote how stiff it is going to be aswell.
And I have frames that I can alter the ride feel by just one simple thing. Change the wheels and I get a different ride. I have a Race geometry bike in Aluminium that is stiff. With the Ultegra wheels it is stiff but not uncomfortable- Put the handbuilts on and it is fine for Century rides with less buzz getting through to me. Put the Aksiums on and it is virtually unridable.
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How long was I in the army? Five foot seven.
Spike Milligan