Answer

Honestly speaking, here in Japan there is no special category of Go bowl shape, such as “Goseigen” nor “Kitani”.
However, many foreign customers have asked me if we produce Goseigen-shape Gosu. All Japanese manufacturers produce standard-shape Gosu only, which means there is only one shape available in Japan.

I have once asked a pupil of Mr. Goseigen about this shape, but he also did not know about it. I assume that the term "Goseigen" or "Kitani" shape is used only among foreign players.