- Aging changes the handling as a chassis grows softer - Different alloys used in construction - Different tube cross section - Different tube layout (i.e. where do they "neck" in the middle, how far apart are axle bearing mounts etc.) - Different mounting points, shapes and usage of torsion bars front and rear - Different standard castor, camber angles - Different construction (material, shape) of steering components such as stubs - Different wheels
etc. etc.
All affect the mechanical properties of a chassis, and therefore how it bends and flexes round a corner, that changes the weight distribution as well as the contact properties of the tyres, causing the difference in handling
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