Do you only have two? If so, you may not get eggs due to over breeding. Coturnix quail should be one male to five females. Keep a close eye on your second one (rosettas aren't feather sexable). If it turns out to be male, they might get along as long as there are no females.
It depends on the colour. Some colours aren't feather sexable, and tuxedos are usually not feather sexable. If the chest feathers don't tell you, sometimes the males will have darker heads.