Assuming the pictures in the Cat-eLog are correct[1], your fish is
C. atropersonatus.
C. kanei has a denser pattern of smaller dots.
C. kanei

Photo: (c) CorydorasWorld
C. atropersonatus

Photo: (c) Johnny Jensen
[1] I am pretty sure the images in the Cat-eLog are correct, as there are pictures of both by Ian Fuller, who is certainly an authority on the subject.
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Mats