I agree, that in conventional conversation internal and external is applicable:
Kaccāna, this world mostly relies on the dual notions of existence and non-existence. 2.2But when you truly see the origin of the world with right understanding, you won’t have the notion of non-existence regarding the world. 2.3And when you truly see the cessation of the world with right understanding, you won’t have the notion of existence regarding the world. Kaccayanagotta sutta
In terms of insight such clear demarcations are disturbed when causally arisen experiences make up the world.