I don't think so and I'll explain why.

With the Hovercraft and Ekranoplan the air cushion has a higher pressure as the surrounding medium. As such it is more akin to planing. This earlier 20th century CARGO ship has a air pocket that was at the same pressure as its surroundings. Basically the first derive lift from a dynamically created difference in pressure above and below the craft while this cargo ship was still fully in displacement mode. In fact that cargo ship design would also work if the trench was fully closed off and there were no pumps. The pumps were only there to keep the trench filled when air is lost due to rolling of the ship and other leaks.

Basically the Hovercraft and Ekranoplan completely dependent on the aircushion in order to remain levitated while this cargo ship could even work when the trench was filled with water. In the latter case it would just have more hull drug. So with the cargoship it was just a means to lower skin friction drag and nothing more. And that is why it could carry lots of cargo.

But yes, there are also strong similarities, all four (incl. planing) aim to put as little surface area into contact with the much denser water as possible in order to lower overall drag.

Wouter