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I'm just starting up my collection and armies for 40k and was wondering if I am able to play both the ultramarines and dark angels together ? I.e. A solid group of each ?

Yes, but they have to be in separate detachments.

Model-wise, who cares, so long as the models match up to the units and they operate under the same rules (some key differences between an Ultramarine Tactical Marine and a DA Tactical Marine).

Excellent! Thank you.