I think your still taking a chance, if your mama is sitting on eggs and they are hatching she might take new ones but at 5 days old and hatched in a bator and not under a broody there is the biggest chance the chicks would not accept the mama, plus the age difference, but your the only one who can make that decision, just be ready to step in if help is needed. and Congrats on more eggs hatching.how about 5days old chicks because mine are four