What are the differences between the young nymphs of these 3 species?

Chinese insect fans

Fourth Instar
A unknown Periplaneta species ootheca hatched several days ago. The ootheca was found in a restaurant. I really don't know whether the babies with black and white color are Periplaneta australasiae, Periplaneta brunnea or Periplaneta fuliginosa. Because the appearance of the young nymphs of the 3 species are nearly the same.

Are the young nymphs of the 3 species are really entirely the same? Or can I tell a difference between them by judging from the appearance? My favorite Periplaneta is Periplaneta fuliginosa. Now I really can't wait knowing what species they are.

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