Try not to read things too literally poddster.

The paper is going through the definitions. In this paragraph they are talking about qualitative equality and how this is affected by space, time and matter. Two different objects (lets say a house and a human) are not the equal. But even if things were the same (lets say a male human and a female human) then they also can't be called equal but they can be called identical simply because they belong to the same species.

It's philosophical semantics.