Bolivian rams are very difficult to sex. Males typically have extensions on the dorsal and caudal fins, however, males don't always gets these. Also, females sometimes get the extensions too. Your fish are look too small to have them either way.
The shape of females and males is also slightly different.
Really, you would need to vent them to know for sure. Your new fish are too small to sex from a picture.
If I were to guess I would say the fish are male/female/male from top to bottom. I would not be at all confident in that determination though. You may need to wait it out.