Will they get along?

[chickens really]

I have 4-5 month old production red hens. I want to add 3 or 4 same aged barred rock or Isa brown girls. Do I need to be care on mixing breeds? I want everyone to be happy

I would stick with red birds...Production reds can be mean with birds of another colour. I had reds last year that pecked my Barred Rocks bald.
I sold all the Reds.