Do you know what style connector it uses? Is it an XLR type connector? I can't find anything on Colortran RFUs (thanks Leviton), so anymore information you can provide would help us help you. Maybe someone around CB has experience with this unit and can tell you what you're looking.
Both fconnectors are from Neutrik and they do not plug into each other. If you are ordering a cable, make sure that the vendor is either getting it from the original manufacturer or is aware that there is a difference and is getting you the right one!