Sterba's Cory vs Mosaic Cory

[pengtsin]

I was curious why a few of my "Corydoras sterbai" were darker and a few were lighter. (Bought them from different stores.)

The best I could do in my internet search is that Corydoras sterbai have white spots on black, and Corydoras haraldschultzi have black spots on white. Not very helpful if you can see these guys I have. The photos on the internet (by my reckoning) are not too helpful either.

Do we have an expert in the group who can tell these guys apart?

Thanks in advance.

[doppelbanddwarf]

This link may be helpful.
http://www.scotcat.com/factsheets/co...s_sterbai.html