It's a different chassis, it's a different length, it's a different wheelbase. You're right, must be the same
The wheelbase can vary across a chassis especially a difference as slight as the 4mm in this case. The M5 has a different rear axle support as it has the M diff, hence the wheelbase variation. It's so slight that they retain an identical (as in the same part) body skeleton. As for length, it's a product of body panels.
It's not ground up on a fresh chassis. It's a hot 5 series with tweaks and changes by M.
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