Is it true that the light KG for sister ships can be assumed to be the same?

The assumption that the light KG (vertical center of gravity) for sister ships is the same is not accurate, making the statement false. While sister ships may share similar designs and specifications, variations in weight distribution, materials used, and construction methods can lead to differences in the vertical center of gravity.

Factors such as alterations in the interior layout, equipment placement, or even variations in the build process can result in different light KG values. Additionally, even small modifications made during construction or different options selected by ship owners can affect the final light KG. Consequently, treating the light KG as the same for all sister ships without evaluating these variables would be incorrect.

Therefore, the correct answer reflects the understanding that while sister ships may have many similarities, they can also have significant differences affecting their stability characteristics.