I think there is great variation within fish species, which is why we so often post here asking what species a fish is. It's likely that it's a Pangio kuhli with a different pattern.
Here's one kuhli I had that started with a strange pattern then went completely brown on me:

(The one closest to the camera)
I have another one with spots in the middle of his saddles just like yours (who is currently hiding, so no pics), and then I have this one:
