Can i Breed Roller Canaries and zebra finches in the same aviary ? 10 points !?

I Have my canaries and finches in seperate cages that are about 2 ft x 3ft x 3 ft but i have a small aviary thats 4ft x 7ft x 4ft could they go in togeather ? my canaries are breeding but the chicks are dieing and i dont know why ?