Sexing Bolivian Rams

[20GL]

Hello everyone! I hope I posted this to the correct section. I just acquired two Bolivian rams. They are already looking great and swimming all over the QT - even though they look a little frazzled by the transport.

Can you please tell me if I got a female/male combo? Also, would I need to rehome one of them if they are the same sex? I am getting mixed answers searching the web. They will live in a 20 gallon long.

Thanks!