To keep an edge over Porsche, Mercedes will take its Modular Rear Architecture (MRA) that's used in the AMG C63, E63, and S63 and give it «unique» wheelbase and
track width measurements as well as a bespoke suspension setup, likely in attempts to make it corner better than the rest of the AMG lineup (save for the AMG GT).
Not exact matches
The estate is marginally bigger than the saloon, at 4,702 mm versus 4,686 mm long and 1,457 mm tall compared to 1,442 mm, but other than that they're largely identical in terms of
measurements (the estate has slightly narrower
track widths).