I often house birds of varied age, gender, breed and laying status together.
The solution that works for me without any real problems is to allow free choice of a range of feeds. Allow a week or 10 days for the birds to adjust to the transition as they are often reluctant to accept different feed. A simple combination would be Laucke Game Bird Starter (28% protein and unmedicated), wheat or layers pellets and shell grit, all ad lib. Many people disagree with choice feeding and believe that poultry have very little innate nutritional wisdom. This link discusses free choice feeding:http://www.lrrd.org/lrrd17/4/pous17045.htm
Eggs from layers fed on growers rations will have very pale yolks unless other supplements such as greenfeed are supplied..