Man, it isn't even mostly about the VLS. Look at the hull design. It boraden as it go downward. On other hand, conventional designs are the opposite.
Neverthless it is the same on both hulls, it broadens and then gets narrow, while conventional hulls are larger above water (flare at the bow and stern sections) and narrower at the waterline while both sharing the same or close waterline beam width (or similar draft to beam and beam to length ratios).
It is more about the VLS, Mk.57 could be the only VLS that is made to fit on sides with safety while others are adaptations leaving the safety at designer's hands (leaving space between the cells and board shell, applying protections, armor etc.). Mk.57 has both a space given between the hull, and has self protection and fail-safe design to get one cell damaged and preventing a spread. When a Mk.41 cell fails it also damages the surrounding cells.
And most lethal threats are expected to arrive close to the waterline (valid until few years ago), a peripheral application has a naturally given large space-escape volume on a tumblehome hull vs conventional hull.
*Purely for scientific use and by luck, the ONRT hull resembles Zumwalt.
An easy comparison between DDG-51, DDG-1000.