What specific differences for three MJX Hyper Go 16212, 16213 and 16218 RC Car Chassis?

What specific structural differences separate the new chassis plate from the old version for the three MJX Hyper Go models: 16212, 16213 and 16218?

The original chassis of older-generation MJX Hyper Go 16-series models used a split construction: a central grey plastic panel fitted with embedded black nylon components on both sides.

The chassis plates on the updated mxj hyper go 16212, 16213 and 16218 have been fully redesigned into a wider one-piece chassis. This widened integrated build delivers superior chassis rigidity alongside improved overall finish and optimized internal layout.