The question was how do you tell whether they are the same kind or not, and you didn't answer that.
quote:
I guess the definition I would use to describe a "kind" would be a group of living organisms having descended from the same ancestral gene pool.
That definition has two big problems. The first is that the scientific tests for common ancestry indicate that there is only one "kind". The second is that the usual creationist definition of "macroevolution" ("evolution between kinds") becomes self-contradictory. All evolution would be "microevolution".