It says they have to be from the same Faction and the BRB only lists 'Orks' as a faction.
So if you ask me: Yes, you can mix and match the units.
The thing I am curious about is how CAD works with Formations.
Example: Can I take an 'Ork Warband', filling all the required slots, and add some Stormboyz to it?
Would those Stormboyz also gain from the Warband-rules?
Or would the entire Warband even lose its special rules?
My guess:
The Warband would be the Primary Detachment.
The Stormboyz need a HQ and troops to become their own Detachment.
Stormboyz benefit from the Waaagh, but not from the Formation special rules.
Seems simpler to just use the Ork Horde-Detachment, but than they'd lose their Waaagh! every turn.
(Asking this for a friend, he received some free Stormboyz when he bought his army and I am glad they will finally see play.. Especially with a 36" range!)
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