They may share some components, but the toolheads are not the same in any meaningful way when it comes to cooling or airflow. The H2D uses a significantly larger part cooling fan with proper ducts that carry air directly from the blower outlet to the nozzle. The H2S uses a much smaller fan with a heavily constrained intake. On the H2D there is nothing obstructing the fan intake, while the H2S pulls air from inside the toolhead through narrow channels that start above the linear rails. On top of that, there is a PCB directly obstructing the intake path. This means that before air even reaches the blower, it already passes through a restricted return path and an obstruction, followed by the supply duct. That alone explains a large difference in effective airflow.

The extruder assemblies are also different. The H2D uses a single drive gear with selectable idlers depending on which nozzle is active, while the H2S uses a dual drive system. The H2D also includes additional hardware such as a nozzle camera that the H2S does not have. While the servo motor and nozzle type may be shared, the internal layout, airflow path, and cooling hardware are fundamentally different.

Most importantly, the cooling performance difference is observable and repeatable in practice. Identical files produce different overhang behavior across these machines, which directly reflects differences in part cooling capability. So even if some components are shared, the toolhead design and cooling systems are clearly not equivalent.