Chickens not integrating with newest chickens

[aart]

Newbie here and planning on introducing two flocks to their coop tomorrow (younger chicks will be in playpen where all may see one another).

Right now both groups are brooding in the same room but in different play pens.

How old are they?
Could probably put both groups in the coop at the same time.
New place for both so no territoriality issues.

 

[Hip Hillbilly Acres]

How old are they?
Could probably put both groups in the coop at the same time.
New place for both so no territoriality issues.

Brood 1 - 3 months
Brood 2 about 2 months