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These are my two pairs of but I'm not sure about my smallest male (in the upper left of the picture). Is him a real contradens?

Another picture.

I would say yes on H.Contradens.

So it could be a variant? It's dependent from the river he came from?

nobody?

I say yes also on the H. Contradens.

Great specimens my friend! Based on Aqualog, each H. Contradens can have its own unique pattern. Oftentimes, their spots can be irregular in sizes and shape. Just like a human fingerprint, no two sets are alike. Based on this reference and on my experience keeping a couple of these Hypans, I would say that they are indeed H. Contradens.

Photos from the sides would better determine if they are not .