Are these two different species of parcoblatta?

Salmonsaladsandwich

Salmonsaladsandwich

Eleventh Instar
Last week I was collecting parcoblatta. Most of the logs and boards I turned over were teeming with these smallish, dark reddish colored nymphs. One, however, had five or six larger nymphs that are light orange in color and have a somewhat different body shape. The darker ones were completely absent from this board even though it looked like perfect habitat. I assumed, of course, that the larger ones were just older nymphs of the same species-surely two similar species can't coexist for long before one drives the other out?- but now I'm in doubt. Do these look like different species?

http://s1303.photobucket.com/user/salmonsaladsandwic/media/image.jpg1_zps2gz7lfcz.jpg.html?sort=3&o=0

http://s1303.photobucket.com/user/salmonsaladsandwic/media/image.jpg2_zpslc39cq4n.jpg.html?sort=3&o=1

(The large one in the second pic is not the same as in the first.)

And here's their little setup:

http://s1303.photobucket.com/user/salmonsaladsandwic/media/image.jpg3_zps6yd6lpib.jpg.html?sort=3&o=2

I don't expect an ID or anything. Just if they look like different species.

 
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