Pygmy corydoras

[lateraldisposition]

I recently started a planted tank with apistogramma, killifish, and Pygmy corydora I got 4 of the little guys about two weeks ago and loved them I went back last night and purchased 6 more I noticed they didn't have many in tank I got them from last time so I said do u think u can find me 6 he replys yes theres more in the tank below ok I said as he scooped up six I get home and put them in I notice the ones I drop in have lines through the middle like my others ones but don't have any spots and are less colorful and have a different shaped face are these two different species or male and female