It's very difficult to say, not because of your pics but because they are not showing their true adult breeding colours.
When they breed or get mature, the male has blue spots all over the body and when displaying or breeding turns his throut red, his fins will also grow into a point when he is the dominant fish in the tank.
The female will be stumpier, have rounded fins,and in colour have speckled blue dots only on her gill covers.
To tell the sexes when there colours and apperance are so similar, if the male is dominant he will be the one displaying, and if he does, will caught the female and you will have a sucessful breeding pair.
If on the other hand the female is dominant, she will chase and attack the male and not let him breed with her, he may be killed if the tank is too small.
Dispite the male being dominant he may show some signs of aggression at first, but once the female realizes that she can benifit the protection of a male, she will axcept him as a mate.