not all rams you can go by the black dot, the dorsal fin.
IF THEY have a pink belly (they are 100% without a doubt a female)
Feed them some live\frozen food - Ex. Blood Worms. - They will start to want to mate, and color up. (do a little water change with a temp difference.) - this way you can be sure.
those two look like they are both females - I would need better pictures.